purr vs vibrate

purr is a noun but vibrate is not a noun.

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

As verbs, vibrate is a hypernym of purr; that is, vibrate is a word with a broader meaning than purr:

Other hypernyms of purr include resonate.

purr (noun)	vibrate (noun)
a low vibrating sound typical of a contented cat

purr (verb)	vibrate (verb)
indicate pleasure by purring; characteristic of cats	feel sudden intense sensation or emotion
make a soft swishing sound	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