agitate vs agitator

agitate is not a noun while agitator is a noun.

Word	Noun	Adjective	Verb	Adverb
agitate	No	No	Yes	No
agitator	Yes	No	No	No

agitate (noun)	agitator (noun)
	one who agitates; a political troublemaker

agitate (verb)	agitator (verb)
change the arrangement or position of
cause to be agitated, excited, or roused
move very slightly
move or cause to move back and forth
try to stir up public opinion
exert oneself continuously, vigorously, or obtrusively to gain an end or engage in a crusade for a certain cause or person; be an advocate for