tremor vs agitate

tremor is a noun but agitate is not a noun.

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

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

Other hypernyms of tremor include shake.

tremor (noun)	agitate (noun)
an involuntary vibration (as if from illness or fear)
a small earthquake
shaking or trembling (usually resulting from weakness or stress or disease)

tremor (verb)	agitate (verb)
shake with seismic vibrations	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