relay transmitter vs relay link

relay transmitter and relay link both are nouns.

Word	Noun	Adjective	Verb	Adverb
relay transmitter	Yes	No	No	No
relay link	Yes	No	No	No

As nouns, relay transmitter and relay link are synonyms defined as:

relay transmitter and relay link: an amplifier for restoring the strength of a transmitted signal

Other synonyms of relay transmitter include booster, booster amplifier, booster station, relay station.

relay transmitter (noun)	relay link (noun)
an amplifier for restoring the strength of a transmitted signal	an amplifier for restoring the strength of a transmitted signal