telegraph line vs telegraph wire

telegraph line and telegraph wire both are nouns.

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

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

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

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

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