telephone line vs telegraph wire

telephone line and telegraph wire both are nouns.

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

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

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

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

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