agitate vs tremble

agitate is not a noun while tremble is a noun.

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

As verbs, tremble is a hyponym of agitate; that is, tremble is a word with a more specific, narrower meaning than agitate:

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

agitate (verb)	tremble (verb)
change the arrangement or position of	move or jerk quickly and involuntarily up and down or sideways
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