A word class is a group of words that have the same basic behaviour.
Word class, also known as part of speech, refers to the category a word belongs to based on its function in a sentence. In English, there are eight main word classes: nouns, pronouns, verbs, adjectives, adverbs, prepositions, conjunctions, and interjections.
Each word class has its own set of characteristics and functions in a sentence, and knowing the word class of a word can help us understand its meaning and use in context.