freeze off vs rebuff

freeze off is not a noun while rebuff is a noun.

Word	Noun	Adjective	Verb	Adverb
freeze off	No	No	Yes	No
rebuff	Yes	No	Yes	No

As verbs, rebuff is a hyponym of freeze off; that is, rebuff is a word with a more specific, narrower meaning than freeze off:

Other hyponyms of freeze off include repel, snub.

freeze off (noun)	rebuff (noun)
	a deliberate discourteous act (usually as an expression of anger or disapproval)
	an instance of driving away or warding off

freeze off (verb)	rebuff (verb)
reject with contempt	reject outright and bluntly
	force or drive back