toll line vs telephone circuit

toll line and telephone circuit both are nouns.

Word	Noun	Adjective	Verb	Adverb
toll line	Yes	No	No	No
telephone circuit	Yes	No	No	No

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

Other hypernyms of toll line include line, phone line, subscriber line, telephone line.

toll line (noun)	telephone circuit (noun)
a telephone line for long-distance calls	a telephone connection