tremble vs agitate

tremble is a noun but agitate is not a noun.

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

As verbs, agitate is a hypernym of tremble; that is, agitate is a word with a broader meaning than tremble:

Other hypernyms of tremble include shake.

tremble (noun)	agitate (noun)
a reflex motion caused by cold or fear or excitement

tremble (verb)	agitate (verb)
move or jerk quickly and involuntarily up and down or sideways	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