relay link vs relay transmitter

relay link and relay transmitter both are nouns.

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

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

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

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

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