waffle vs vibrate

waffle is a noun but vibrate is not a noun.

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

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

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

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

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

waffle (verb)	vibrate (verb)
pause or hold back in uncertainty or unwillingness	feel sudden intense sensation or emotion
	shake, quiver, or throb; move back and forth rapidly, usually in an uncontrolled manner
	move or swing from side to side regularly
	sound with resonance
	be undecided about something; waver between conflicting positions or courses of action