Parts of Speech are categories that defines a word's grammatical function, meaning and behavior within a sentence.
For Examples,
1. Noun: Teacher, cat, England etc.
2. Pronoun: He, she, it, they, etc.
3. Adjectives : Smart, healthy, red etc.
4. Verb: Teach, eat, walk, etc.
5. Adverb: Happily, quickly, slowly, etc.
6. Preposition: in, at, on, over, etc.
7. Conjunctions: and, so, but, nor, yet, etc.
8. Interjection: wow, hurrah, oops, etc.