coupler vs couple

coupler and couple both are nouns.

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

coupler (noun)	couple (noun)
a mechanical device that serves to connect the ends of adjacent objects	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

coupler (verb)	couple (verb)
	engage in sexual intercourse
	link together
	bring two objects, ideas, or people together
	form a pair or pairs