rebuff vs reject

rebuff and reject both are nouns.

Word	Noun	Adjective	Verb	Adverb
rebuff	Yes	No	Yes	No
reject	Yes	No	Yes	No

As verbs, reject is a hypernym of rebuff; that is, reject is a word with a broader meaning than rebuff:

Other hypernyms of rebuff include disdain, freeze off, pooh-pooh, scorn, spurn, turn down.

rebuff (noun)	reject (noun)
a deliberate discourteous act (usually as an expression of anger or disapproval)	the person or thing that is rejected or set aside as inferior in quality
an instance of driving away or warding off

rebuff (verb)	reject (verb)
reject outright and bluntly	not accept something given or offered
force or drive back	dismiss from consideration or a contest
	deem wrong or inappropriate
	reject with contempt
	not accept as true
	refuse entrance or membership
	resist immunologically the introduction of some foreign tissue or organ