* Noun: A wave of water, a wave of people, a wave of the hand.
* Verb: To move your hand back and forth as a greeting, to move in a wave-like pattern.
* Adjective: Describing something that is wave-like.
It is NOT a pronoun. Pronouns are words that replace nouns (like "he," "she," "it," "they").
To determine the part of speech, you need to see it in a sentence:
* "The ocean wave crashed against the shore." (Wave is a noun)
* "She waved goodbye to her friend." (Wave is a verb)
* "The wave-shaped design was very intricate." (Wave is an adjective)