Here's why:
* Adverbs modify verbs, adjectives, or other adverbs. They tell us how, when, where, or to what extent something is done.
* Adjectives describe nouns or pronouns. They tell us what kind, how many, or which one.
Examples:
* Ill (adjective): She felt ill and stayed home from school. (Describing how she felt)
* Badly (adverb): He played badly in the game. (Modifying the verb "played")
Let me know if you have any other words you'd like to classify!