booster

noun

1.
2.
someone who is an active supporter and advocate
plugger promoter
Derived from:
boost
3.
a thief who steals goods that are in a store
lifter shoplifter
4.
an amplifier for restoring the strength of a transmitted signal
booster amplifier booster station relay link relay station relay transmitter
5.
the first stage of a multistage rocket
booster rocket booster unit takeoff booster takeoff rocket
Derived from:
boost
6.
an additional dose that makes sure the first dose was effective
one-shot-wonder booster dose booster shot recall dose