diff --git a/tempest/api/compute/images/test_list_image_filters.py b/tempest/api/compute/images/test_list_image_filters.py
index 8ace879..c04729c 100644
--- a/tempest/api/compute/images/test_list_image_filters.py
+++ b/tempest/api/compute/images/test_list_image_filters.py
@@ -220,7 +220,7 @@
         self.assertTrue(any([i for i in images if i['id'] == self.image1_id]))
 
     @attr(type=['negative', 'gate'])
-    def test_get_nonexistant_image(self):
+    def test_get_nonexistent_image(self):
         # Negative test: GET on non-existent image should fail
         self.assertRaises(exceptions.NotFound, self.client.get_image, 999)
 
diff --git a/tempest/api/compute/keypairs/test_keypairs_negative.py b/tempest/api/compute/keypairs/test_keypairs_negative.py
index 85b8505..93b0692 100644
--- a/tempest/api/compute/keypairs/test_keypairs_negative.py
+++ b/tempest/api/compute/keypairs/test_keypairs_negative.py
@@ -41,9 +41,9 @@
                           self._create_keypair, k_name, pub_key)
 
     @test.attr(type=['negative', 'gate'])
-    def test_keypair_delete_nonexistant_key(self):
-        # Non-existant key deletion should throw a proper error
-        k_name = data_utils.rand_name("keypair-non-existant-")
+    def test_keypair_delete_nonexistent_key(self):
+        # Non-existent key deletion should throw a proper error
+        k_name = data_utils.rand_name("keypair-non-existent-")
         self.assertRaises(exceptions.NotFound, self.client.delete_keypair,
                           k_name)
 
diff --git a/tempest/api/compute/servers/test_servers_negative.py b/tempest/api/compute/servers/test_servers_negative.py
index a389c27..8f49aec 100644
--- a/tempest/api/compute/servers/test_servers_negative.py
+++ b/tempest/api/compute/servers/test_servers_negative.py
@@ -195,7 +195,7 @@
                           networks=networks)
 
     @test.attr(type=['negative', 'gate'])
-    def test_create_with_non_existant_keypair(self):
+    def test_create_with_non_existent_keypair(self):
         # Pass a non-existent keypair while creating a server
 
         key_name = data_utils.rand_name('key')
diff --git a/tempest/api/compute/v3/images/test_list_image_filters.py b/tempest/api/compute/v3/images/test_list_image_filters.py
index 8ace879..c04729c 100644
--- a/tempest/api/compute/v3/images/test_list_image_filters.py
+++ b/tempest/api/compute/v3/images/test_list_image_filters.py
@@ -220,7 +220,7 @@
         self.assertTrue(any([i for i in images if i['id'] == self.image1_id]))
 
     @attr(type=['negative', 'gate'])
-    def test_get_nonexistant_image(self):
+    def test_get_nonexistent_image(self):
         # Negative test: GET on non-existent image should fail
         self.assertRaises(exceptions.NotFound, self.client.get_image, 999)
 
diff --git a/tempest/api/compute/v3/keypairs/test_keypairs_negative.py b/tempest/api/compute/v3/keypairs/test_keypairs_negative.py
index 5180c72..be7ee65 100644
--- a/tempest/api/compute/v3/keypairs/test_keypairs_negative.py
+++ b/tempest/api/compute/v3/keypairs/test_keypairs_negative.py
@@ -41,9 +41,9 @@
                           self._create_keypair, k_name, pub_key)
 
     @test.attr(type=['negative', 'gate'])
-    def test_keypair_delete_nonexistant_key(self):
-        # Non-existant key deletion should throw a proper error
-        k_name = data_utils.rand_name("keypair-non-existant-")
+    def test_keypair_delete_nonexistent_key(self):
+        # Non-existent key deletion should throw a proper error
+        k_name = data_utils.rand_name("keypair-non-existent-")
         self.assertRaises(exceptions.NotFound, self.client.delete_keypair,
                           k_name)
 
diff --git a/tempest/api/compute/v3/servers/test_servers_negative.py b/tempest/api/compute/v3/servers/test_servers_negative.py
index bb80293..29cbc92 100644
--- a/tempest/api/compute/v3/servers/test_servers_negative.py
+++ b/tempest/api/compute/v3/servers/test_servers_negative.py
@@ -183,7 +183,7 @@
                           networks=networks)
 
     @test.attr(type=['negative', 'gate'])
-    def test_create_with_non_existant_keypair(self):
+    def test_create_with_non_existent_keypair(self):
         # Pass a non-existent keypair while creating a server
 
         key_name = data_utils.rand_name('key')
diff --git a/tempest/api/compute/volumes/test_volumes_negative.py b/tempest/api/compute/volumes/test_volumes_negative.py
index b653600..e01e349 100644
--- a/tempest/api/compute/volumes/test_volumes_negative.py
+++ b/tempest/api/compute/volumes/test_volumes_negative.py
@@ -33,18 +33,18 @@
             raise cls.skipException(skip_msg)
 
     @attr(type=['negative', 'gate'])
-    def test_volume_get_nonexistant_volume_id(self):
-        # Negative: Should not be able to get details of nonexistant volume
-        # Creating a nonexistant volume id
-        # Trying to GET a non existant volume
+    def test_volume_get_nonexistent_volume_id(self):
+        # Negative: Should not be able to get details of nonexistent volume
+        # Creating a nonexistent volume id
+        # Trying to GET a non existent volume
         self.assertRaises(exceptions.NotFound, self.client.get_volume,
                           str(uuid.uuid4()))
 
     @attr(type=['negative', 'gate'])
-    def test_volume_delete_nonexistant_volume_id(self):
-        # Negative: Should not be able to delete nonexistant Volume
-        # Creating nonexistant volume id
-        # Trying to DELETE a non existant volume
+    def test_volume_delete_nonexistent_volume_id(self):
+        # Negative: Should not be able to delete nonexistent Volume
+        # Creating nonexistent volume id
+        # Trying to DELETE a non existent volume
         self.assertRaises(exceptions.NotFound, self.client.delete_volume,
                           str(uuid.uuid4()))
 
diff --git a/tempest/api/identity/admin/test_roles_negative.py b/tempest/api/identity/admin/test_roles_negative.py
index cc53b60..4eaa255 100644
--- a/tempest/api/identity/admin/test_roles_negative.py
+++ b/tempest/api/identity/admin/test_roles_negative.py
@@ -192,37 +192,37 @@
         self.client.clear_auth()
 
     @attr(type=['negative', 'gate'])
-    def test_remove_user_role_non_existant_user(self):
+    def test_remove_user_role_non_existent_user(self):
         # Attempt to remove a role from a non existent user should fail
         (user, tenant, role) = self._get_role_params()
         resp, user_role = self.client.assign_user_role(tenant['id'],
                                                        user['id'],
                                                        role['id'])
-        non_existant_user = str(uuid.uuid4().hex)
+        non_existent_user = str(uuid.uuid4().hex)
         self.assertRaises(exceptions.NotFound, self.client.remove_user_role,
-                          tenant['id'], non_existant_user, role['id'])
+                          tenant['id'], non_existent_user, role['id'])
 
     @attr(type=['negative', 'gate'])
-    def test_remove_user_role_non_existant_role(self):
+    def test_remove_user_role_non_existent_role(self):
         # Attempt to delete a non existent role from a user should fail
         (user, tenant, role) = self._get_role_params()
         resp, user_role = self.client.assign_user_role(tenant['id'],
                                                        user['id'],
                                                        role['id'])
-        non_existant_role = str(uuid.uuid4().hex)
+        non_existent_role = str(uuid.uuid4().hex)
         self.assertRaises(exceptions.NotFound, self.client.remove_user_role,
-                          tenant['id'], user['id'], non_existant_role)
+                          tenant['id'], user['id'], non_existent_role)
 
     @attr(type=['negative', 'gate'])
-    def test_remove_user_role_non_existant_tenant(self):
+    def test_remove_user_role_non_existent_tenant(self):
         # Attempt to remove a role from a non existent tenant should fail
         (user, tenant, role) = self._get_role_params()
         resp, user_role = self.client.assign_user_role(tenant['id'],
                                                        user['id'],
                                                        role['id'])
-        non_existant_tenant = str(uuid.uuid4().hex)
+        non_existent_tenant = str(uuid.uuid4().hex)
         self.assertRaises(exceptions.NotFound, self.client.remove_user_role,
-                          non_existant_tenant, user['id'], role['id'])
+                          non_existent_tenant, user['id'], role['id'])
 
     @attr(type=['negative', 'gate'])
     def test_list_user_roles_by_unauthorized_user(self):
diff --git a/tempest/api/identity/admin/test_users_negative.py b/tempest/api/identity/admin/test_users_negative.py
index 1170c6f..ba7af09 100644
--- a/tempest/api/identity/admin/test_users_negative.py
+++ b/tempest/api/identity/admin/test_users_negative.py
@@ -64,7 +64,7 @@
                           self.data.tenant['id'], self.data.test_email)
 
     @attr(type=['negative', 'gate'])
-    def test_create_user_for_non_existant_tenant(self):
+    def test_create_user_for_non_existent_tenant(self):
         # Attempt to create a user in a non-existent tenant should fail
         self.assertRaises(exceptions.NotFound, self.client.create_user,
                           self.alt_user, self.alt_password, '49ffgg99999',
@@ -96,7 +96,7 @@
                           self.alt_email, enabled=3)
 
     @attr(type=['negative', 'gate'])
-    def test_update_user_for_non_existant_user(self):
+    def test_update_user_for_non_existent_user(self):
         # Attempt to update a user non-existent user should fail
         user_name = data_utils.rand_name('user-')
         non_existent_id = str(uuid.uuid4())
@@ -133,7 +133,7 @@
                           self.data.user['id'])
 
     @attr(type=['negative', 'gate'])
-    def test_delete_non_existant_user(self):
+    def test_delete_non_existent_user(self):
         # Attempt to delete a non-existent user should fail
         self.assertRaises(exceptions.NotFound, self.client.delete_user,
                           'junk12345123')
diff --git a/tempest/api/volume/test_volumes_negative.py b/tempest/api/volume/test_volumes_negative.py
index 7d9f894..284c321 100644
--- a/tempest/api/volume/test_volumes_negative.py
+++ b/tempest/api/volume/test_volumes_negative.py
@@ -34,14 +34,14 @@
         cls.mountpoint = "/dev/vdc"
 
     @attr(type=['negative', 'gate'])
-    def test_volume_get_nonexistant_volume_id(self):
-        # Should not be able to get a non-existant volume
+    def test_volume_get_nonexistent_volume_id(self):
+        # Should not be able to get a non-existent volume
         self.assertRaises(exceptions.NotFound, self.client.get_volume,
                           str(uuid.uuid4()))
 
     @attr(type=['negative', 'gate'])
-    def test_volume_delete_nonexistant_volume_id(self):
-        # Should not be able to delete a non-existant Volume
+    def test_volume_delete_nonexistent_volume_id(self):
+        # Should not be able to delete a non-existent Volume
         self.assertRaises(exceptions.NotFound, self.client.delete_volume,
                           str(uuid.uuid4()))
 
@@ -80,8 +80,8 @@
                           size='-1', display_name=v_name, metadata=metadata)
 
     @attr(type=['negative', 'gate'])
-    def test_create_volume_with_nonexistant_volume_type(self):
-        # Should not be able to create volume with non-existant volume type
+    def test_create_volume_with_nonexistent_volume_type(self):
+        # Should not be able to create volume with non-existent volume type
         v_name = data_utils.rand_name('Volume-')
         metadata = {'Type': 'work'}
         self.assertRaises(exceptions.NotFound, self.client.create_volume,
@@ -89,8 +89,8 @@
                           display_name=v_name, metadata=metadata)
 
     @attr(type=['negative', 'gate'])
-    def test_create_volume_with_nonexistant_snapshot_id(self):
-        # Should not be able to create volume with non-existant snapshot
+    def test_create_volume_with_nonexistent_snapshot_id(self):
+        # Should not be able to create volume with non-existent snapshot
         v_name = data_utils.rand_name('Volume-')
         metadata = {'Type': 'work'}
         self.assertRaises(exceptions.NotFound, self.client.create_volume,
@@ -98,8 +98,8 @@
                           display_name=v_name, metadata=metadata)
 
     @attr(type=['negative', 'gate'])
-    def test_create_volume_with_nonexistant_source_volid(self):
-        # Should not be able to create volume with non-existant source volume
+    def test_create_volume_with_nonexistent_source_volid(self):
+        # Should not be able to create volume with non-existent source volume
         v_name = data_utils.rand_name('Volume-')
         metadata = {'Type': 'work'}
         self.assertRaises(exceptions.NotFound, self.client.create_volume,
@@ -107,7 +107,7 @@
                           display_name=v_name, metadata=metadata)
 
     @attr(type=['negative', 'gate'])
-    def test_update_volume_with_nonexistant_volume_id(self):
+    def test_update_volume_with_nonexistent_volume_id(self):
         v_name = data_utils.rand_name('Volume-')
         metadata = {'Type': 'work'}
         self.assertRaises(exceptions.NotFound, self.client.update_volume,