agitate vs jiggle

agitate is not a noun while jiggle is a noun.

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

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

agitate (noun)	jiggle (noun)
	a slight irregular shaking motion

agitate (verb)	jiggle (verb)
change the arrangement or position of	move to and fro
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