telephone circuit vs connector

telephone circuit and connector both are nouns.

Word	Noun	Adjective	Verb	Adverb
telephone circuit	Yes	No	No	No
connector	Yes	No	No	No

As nouns, connector is a hypernym of telephone circuit; that is, connector is a word with a broader meaning than telephone circuit:

Other hypernyms of telephone circuit include connecter, connection, connective, connexion.

telephone circuit (noun)	connector (noun)
a telephone connection	an instrumentality that connects