coupling vs connecter

coupling and connecter both are nouns.

Word	Noun	Adjective	Verb	Adverb
coupling	Yes	No	No	No
connecter	Yes	No	No	No

As nouns, connecter is a hypernym of coupling; that is, connecter is a word with a broader meaning than coupling:

coupling: a connection (like a clamp or vise) between two things so they move together
connecter: an instrumentality that connects

Other hypernyms of coupling include connection, connective, connector, connexion.

coupling (noun)	connecter (noun)
the act of pairing a male and female for reproductive purposes	an instrumentality that connects
a mechanical device that serves to connect the ends of adjacent objects
a connection (like a clamp or vise) between two things so they move together