toll line vs phone line

toll line and phone line both are nouns.

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

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

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

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