The categories can be based on:
* Parts of speech: Nouns, verbs, adjectives, etc.
* Themes: Animals, colors, transportation, etc.
* Phonics patterns: Words with the same vowel sound, words with the same spelling pattern, etc.
* Vocabulary units: Words related to a specific topic being studied.
The purpose of a word wall is to help learners visualize and remember words, making them more confident and fluent in their reading and writing.