vacillate vs fluctuate

vacillate and fluctuate both are verbs.

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

As verbs, vacillate and fluctuate are synonyms defined as:

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

Other synonyms of vacillate include waver.

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