relay link vs booster

relay link and booster both are nouns.

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

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

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

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

relay link (noun)	booster (noun)
an amplifier for restoring the strength of a transmitted signal	an additional dose that makes sure the first dose was effective
	the first stage of a multistage rocket
	an amplifier for restoring the strength of a transmitted signal
	a thief who steals goods that are in a store
	someone who is an active supporter and advocate
	a person who backs a politician or a team etc.