waver vs vacillate

waver is a noun but vacillate is not a noun.

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

As verbs, waver and vacillate are synonyms defined as:

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

Other synonyms of waver include fluctuate.

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

waver: pause or hold back in uncertainty or unwillingness
vacillate: be undecided about something; waver between conflicting positions or courses of action

Other hyponyms of waver include dwell on, linger over, boggle, hover, linger, hover, oscillate, vibrate, falter, waver.

waver (noun)	vacillate (noun)
the act of moving back and forth
the act of pausing uncertainly
someone who communicates by waving

waver (verb)	vacillate (verb)
give off unsteady sounds, alternating in amplitude or frequency	move or sway in a rising and falling or wavelike pattern
sway from side to side	be undecided about something; waver between conflicting positions or courses of action
move or sway in a rising and falling or wavelike pattern
move back and forth very rapidly
move hesitatingly, as if about to give way
pause or hold back in uncertainty or unwillingness
be unsure or weak