telegraph wire vs telephone line

telegraph wire and telephone line both are nouns.

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

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

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

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

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