relay link vs booster amplifier

relay link and booster amplifier both are nouns.

Word	Noun	Adjective	Verb	Adverb
relay link	Yes	No	No	No
booster amplifier	Yes	No	No	No

As nouns, relay link and booster amplifier are synonyms defined as:

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

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

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