agitate vs plump up

agitate and plump up both are verbs.

Word	Noun	Adjective	Verb	Adverb
agitate	No	No	Yes	No
plump up	No	No	Yes	No

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

agitate (verb)	plump up (verb)
change the arrangement or position of	make fuller by shaking
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