vacillate vs waffle

vacillate is not a noun while waffle is a noun.

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

As verbs, waffle is a hypernym of vacillate; that is, waffle is a word with a broader meaning than vacillate:

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

Other hypernyms of vacillate include hesitate, waver.

vacillate (noun)	waffle (noun)
	pancake batter baked in a waffle iron

vacillate (verb)	waffle (verb)
move or sway in a rising and falling or wavelike pattern	pause or hold back in uncertainty or unwillingness
be undecided about something; waver between conflicting positions or courses of action