mismatch vs couple

mismatch and couple both are nouns.

Word	Noun	Adjective	Verb	Adverb
mismatch	Yes	No	Yes	No
couple	Yes	No	Yes	No

As verbs, couple is a hypernym of mismatch; that is, couple is a word with a broader meaning than mismatch:

Other hypernyms of mismatch include match, mate, pair, twin.

mismatch (noun)	couple (noun)
a bad or unsuitable match	a pair who associate with one another
	a pair of people who live together
	(physics) something joined by two equal and opposite forces that act along parallel lines
	two items of the same kind
	a small indefinite number

mismatch (verb)	couple (verb)
match badly; match two objects or people that do not go together	engage in sexual intercourse
	link together
	bring two objects, ideas, or people together
	form a pair or pairs