The word agitated is a verb. It is the past tense of the verb agitate.
Don't agitate me!
Agitate is like when you get mad, so you could say : The kid says I agitate him.
The part of speech for this particular word is a noun.
part of speech
The part of speech for "answer" is a noun.
adverb
what part of speech is beneath
The part of speech for "unfamiliar" is an adjective.
The part of speech of "came" is a verb.
The part of speech for "twirl" is a verb.
The part of speech for "explicit" is an adjective.
The part of speech for "indefinite" is an adjective.