Vocabulary.com is free for students when you sign up for an account. Students will learn vocabulary words they need to know with three different activities: practice, spelling bee, or vocabulary jam.
Use Quizlet flashcards to learn words that commonly appear in many state standardized tests for 4th grade.
Discovery Education is a great resource if you're looking to create your own crossword or word search.
Explore a variety of word games on Arkadium to practice spelling and vocabulary skills.