telegraph wire vs telegraph line

telegraph wire and telegraph line both are nouns.

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

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

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

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

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