diff --git a/railties/lib/minitest/rails_plugin.rb b/railties/lib/minitest/rails_plugin.rb
index 6486fa1798..4b7df6360a 100644
--- a/railties/lib/minitest/rails_plugin.rb
+++ b/railties/lib/minitest/rails_plugin.rb
@@ -54,6 +54,6 @@ module Minitest
     end
   end
 
-  # Backwardscompatibility with Rails 5.0 generated plugin test scripts
+  # Backwards compatibility with Rails 5.0 generated plugin test scripts
   mattr_reader :run_via, default: {}
 end
diff --git a/railties/lib/rails/app_loader.rb b/railties/lib/rails/app_loader.rb
index aabcc5970c..cc057a407d 100644
--- a/railties/lib/rails/app_loader.rb
+++ b/railties/lib/rails/app_loader.rb
@@ -23,7 +23,7 @@ control:
                                 # too that you may or may not want (like yarn)
 
 If you already have Rails binstubs in source control, you might be
-inadverently overwriting them during deployment by using bundle install
+inadvertently overwriting them during deployment by using bundle install
 with the --binstubs option.
 
 If your application was created prior to Rails 4, here's how to upgrade:
diff --git a/railties/test/application/test_runner_test.rb b/railties/test/application/test_runner_test.rb
index f706e53e5c..0bdd2b314d 100644
--- a/railties/test/application/test_runner_test.rb
+++ b/railties/test/application/test_runner_test.rb
@@ -16,7 +16,7 @@ module ApplicationTests
       teardown_app
     end
 
-    def test_run_via_backwardscompatibility
+    def test_run_via_backwards_compatibility
       require "minitest/rails_plugin"
 
       assert_nothing_raised do
diff --git a/railties/test/commands/credentials_test.rb b/railties/test/commands/credentials_test.rb
index 26ffe3070c..10d0ba1cae 100644
--- a/railties/test/commands/credentials_test.rb
+++ b/railties/test/commands/credentials_test.rb
@@ -63,7 +63,7 @@ class Rails::Command::CredentialsCommandTest < ActiveSupport::TestCase
     end
   end
 
-  test "edit command does not raise when an initializer tries to acces non-existent credentials" do
+  test "edit command does not raise when an initializer tries to access non-existent credentials" do
     app_file "config/initializers/raise_when_loaded.rb", <<-RUBY
       Rails.application.credentials.missing_key!
     RUBY
diff --git a/railties/test/commands/dbconsole_test.rb b/railties/test/commands/dbconsole_test.rb
index adb168f7a3..65f6916acb 100644
--- a/railties/test/commands/dbconsole_test.rb
+++ b/railties/test/commands/dbconsole_test.rb
@@ -112,9 +112,9 @@ class Rails::DBConsoleTest < ActiveSupport::TestCase
   end
 
   def test_mysql_full
-    start(adapter: "mysql2", database: "db", host: "locahost", port: 1234, socket: "socket", username: "user", password: "qwerty", encoding: "UTF-8")
+    start(adapter: "mysql2", database: "db", host: "localhost", port: 1234, socket: "socket", username: "user", password: "qwerty", encoding: "UTF-8")
     assert_not aborted
-    assert_equal [%w[mysql mysql5], "--host=locahost", "--port=1234", "--socket=socket", "--user=user", "--default-character-set=UTF-8", "-p", "db"], dbconsole.find_cmd_and_exec_args
+    assert_equal [%w[mysql mysql5], "--host=localhost", "--port=1234", "--socket=socket", "--user=user", "--default-character-set=UTF-8", "-p", "db"], dbconsole.find_cmd_and_exec_args
   end
 
   def test_mysql_include_password
diff --git a/railties/test/generators/app_generator_test.rb b/railties/test/generators/app_generator_test.rb
index e0cd7f90ce..860e2bf63e 100644
--- a/railties/test/generators/app_generator_test.rb
+++ b/railties/test/generators/app_generator_test.rb
@@ -199,7 +199,7 @@ class AppGeneratorTest < Rails::Generators::TestCase
     end
   end
 
-  def test_new_application_use_json_serialzier
+  def test_new_application_use_json_serializer
     run_generator
 
     assert_file("config/initializers/cookies_serializer.rb", /Rails\.application\.config\.action_dispatch\.cookies_serializer = :json/)
diff --git a/railties/test/generators/mailer_generator_test.rb b/railties/test/generators/mailer_generator_test.rb
index ddac6e1a1e..099e06c4d3 100644
--- a/railties/test/generators/mailer_generator_test.rb
+++ b/railties/test/generators/mailer_generator_test.rb
@@ -119,7 +119,7 @@ class MailerGeneratorTest < Rails::Generators::TestCase
     assert_match(/haml \[not found\]/, content)
   end
 
-  def test_mailer_with_namedspaced_mailer
+  def test_mailer_with_namespaced_mailer
     run_generator ["Farm::Animal", "moos"]
     assert_file "app/mailers/farm/animal_mailer.rb" do |mailer|
       assert_match(/class Farm::AnimalMailer < ApplicationMailer/, mailer)
diff --git a/railties/test/generators/model_generator_test.rb b/railties/test/generators/model_generator_test.rb
index b06db6dd8a..134659f285 100644
--- a/railties/test/generators/model_generator_test.rb
+++ b/railties/test/generators/model_generator_test.rb
@@ -104,7 +104,7 @@ class ModelGeneratorTest < Rails::Generators::TestCase
     ActiveRecord::Base.pluralize_table_names = true
   end
 
-  def test_migration_with_namespaces_in_model_name_without_plurization
+  def test_migration_with_namespaces_in_model_name_without_pluralization
     ActiveRecord::Base.pluralize_table_names = false
     run_generator ["Gallery::Image"]
     assert_migration "db/migrate/create_gallery_image", /class CreateGalleryImage < ActiveRecord::Migration\[[0-9.]+\]/
diff --git a/railties/test/generators/plugin_generator_test.rb b/railties/test/generators/plugin_generator_test.rb
index 4ec656d18b..f45464f8d0 100644
--- a/railties/test/generators/plugin_generator_test.rb
+++ b/railties/test/generators/plugin_generator_test.rb
@@ -442,7 +442,7 @@ class PluginGeneratorTest < Rails::Generators::TestCase
     end
   end
 
-  def test_dummy_appplication_skip_listen_by_default
+  def test_dummy_application_skip_listen_by_default
     run_generator
 
     assert_file "test/dummy/config/environments/development.rb" do |contents|
diff --git a/railties/test/isolation/abstract_unit.rb b/railties/test/isolation/abstract_unit.rb
index 01b6cb0a43..e9cf60a13d 100644
--- a/railties/test/isolation/abstract_unit.rb
+++ b/railties/test/isolation/abstract_unit.rb
@@ -483,7 +483,7 @@ Module.new do
 
   Dir.chdir(app_template_path) { `yarn add https://github.com/rails/webpacker.git` } # Use the latest version.
 
-  # Manually install `webpack` as bin symlinks are not created for subdependencies
+  # Manually install `webpack` as bin symlinks are not created for sub dependencies
   # in workspaces. See https://github.com/yarnpkg/yarn/issues/4964
   Dir.chdir(app_template_path) { `yarn add webpack@4.17.1 --tilde` }
   Dir.chdir(app_template_path) { `yarn add webpack-cli` }
diff --git a/railties/test/railties/mounted_engine_test.rb b/railties/test/railties/mounted_engine_test.rb
index 48f0fbc80f..9755823e51 100644
--- a/railties/test/railties/mounted_engine_test.rb
+++ b/railties/test/railties/mounted_engine_test.rb
@@ -232,7 +232,7 @@ module ApplicationTests
       get "/someone/blog/generate_application_route"
       assert_equal "/", last_response.body
 
-      get "/somone/blog/application_route_in_view"
+      get "/someone/blog/application_route_in_view"
       assert_equal "/", last_response.body
 
       # test generating engine's route from other engine
@@ -258,8 +258,8 @@ module ApplicationTests
       assert_equal "http://example.org/anonymous/blog/posts/44", last_response.body
 
       # test that correct path is generated for the same polymorphic_path call in an engine
-      get "/somone/blog/engine_polymorphic_path"
-      assert_equal "/somone/blog/posts/44", last_response.body
+      get "/someone/blog/engine_polymorphic_path"
+      assert_equal "/someone/blog/posts/44", last_response.body
 
       # and in an application
       get "/application_polymorphic_path"