booster station vs relay link

booster station and relay link both are nouns.

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

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

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

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

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