1. Nouns: Words that name people, places, things, or ideas. (e.g., *cat, house, happiness*)
2. Pronouns: Words that replace nouns. (e.g., *he, she, it, they*)
3. Verbs: Words that show action or state of being. (e.g., *run, jump, think, be*)
4. Adjectives: Words that describe nouns or pronouns. (e.g., *big, red, happy*)
5. Adverbs: Words that modify verbs, adjectives, or other adverbs. (e.g., *quickly, slowly, very*)
6. Prepositions: Words that show the relationship between a noun or pronoun and another word in the sentence. (e.g., *on, in, under, over*)
7. Conjunctions: Words that connect words, phrases, or clauses. (e.g., *and, but, or, so*)
8. Interjections: Words that express strong emotions. (e.g., *Wow!, Ouch!, Help!)
9. Determiners: Words that introduce nouns and specify their quantity or particularity. (e.g., *a, an, the, some, many*)
It's important to note that the categorization of words into parts of speech can sometimes be fluid, and some words can function as more than one part of speech depending on their context in a sentence.