Nouns

(n)supporter, protagonist, champion, admirer, booster, frienda person who backs a politician or a team etc.“all their supporters came out for the game”, “they are friends of the library”
(n)promoter, booster, pluggersomeone who is an active supporter and advocate
(n)booster, shoplifter, liftera thief who steals goods that are in a store
(n)booster, booster amplifier, booster station, relay link, relay station, relay transmitteran amplifier for restoring the strength of a transmitted signal
(n)booster, booster rocket, booster unit, takeoff booster, takeoff rocketthe first stage of a multistage rocket
(n)booster, booster dose, booster shot, recall dosean additional dose that makes sure the first dose was effective