booster station vs relay station

booster station and relay station both are nouns.

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

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

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

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

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