fluctuate vs fluctuation

fluctuate is not a noun while fluctuation is a noun.

Word	Noun	Adjective	Verb	Adverb
fluctuate	No	No	Yes	No
fluctuation	Yes	No	No	No

fluctuate (noun)	fluctuation (noun)
	the quality of being unsteady and subject to changes
	an instance of change; the rate or magnitude of change
	a wave motion

fluctuate (verb)	fluctuation (verb)
be unstable
move or sway in a rising and falling or wavelike pattern
cause to fluctuate or move in a wavelike pattern