1. supporter, protagonist, champion, admirer, booster, friend, advocate, advocator, proponent, exponent

usage: a person who backs a politician or a team etc.; "all their supporters came out for the game"; "they are friends of the library"

2. promoter, booster, plugger, advertiser, advertizer, adman

usage: someone who is an active supporter and advocate

3. booster, shoplifter, lifter, thief, stealer

usage: a thief who steals goods that are in a store

4. booster, booster amplifier, booster station, relay link, relay station, relay transmitter, amplifier

usage: an amplifier for restoring the strength of a transmitted signal

5. booster, booster rocket, booster unit, takeoff booster, takeoff rocket, rocket, rocket engine

usage: the first stage of a multistage rocket

6. booster, booster dose, booster shot, recall dose, dose, dosage

usage: an additional dose that makes sure the first dose was effective

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See also: booster (Dictionary)