toll line vs telephone line

toll line and telephone line both are nouns.

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

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

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

toll line (noun)	telephone line (noun)
a telephone line for long-distance calls	a telephone connection
	the wire that carries telegraph and telephone signals