fluctuate vs vacillate

fluctuate and vacillate both are verbs.

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

As verbs, fluctuate and vacillate are synonyms defined as:

fluctuate and vacillate: move or sway in a rising and falling or wavelike pattern

Other synonyms of fluctuate include waver.

fluctuate (verb)	vacillate (verb)
be unstable	move or sway in a rising and falling or wavelike pattern
move or sway in a rising and falling or wavelike pattern	be undecided about something; waver between conflicting positions or courses of action
cause to fluctuate or move in a wavelike pattern