telephone line vs telephone wire

telephone line and telephone wire both are nouns.

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

As nouns, telephone line and telephone wire are synonyms defined as:

telephone line and telephone wire: the wire that carries telegraph and telephone signals

Other synonyms of telephone line include telegraph line, telegraph wire.

telephone line (noun)	telephone wire (noun)
a telephone connection	the wire that carries telegraph and telephone signals
the wire that carries telegraph and telephone signals