booster

nouns

a person who backs a politician or a team etc.
"all their supporters came out for the game"; "they are friends of the library"
admirer, booster, champion, friend, protagonist, supporter
is derived from
boost
someone who is an active supporter and advocate
booster, plugger, promoter
is derived from
boost
a thief who steals goods that are in a store
booster, lifter, shoplifter
an amplifier for restoring the strength of a transmitted signal
booster, booster amplifier, booster station, relay link, relay station, relay transmitter
the first stage of a multistage rocket
booster, booster rocket, booster unit, takeoff booster, takeoff rocket
is derived from
boost
an additional dose that makes sure the first dose was effective
booster, booster dose, booster shot, recall dose