booster

definition: an additional dose that makes sure the first dose was effective
example:
speech part: noun
synonyms: booster dose booster shot recall dose
definition: the first stage of a multistage rocket
example:
speech part: noun
synonyms: booster rocket booster unit takeoff booster takeoff rocket
definition: an amplifier for restoring the strength of a transmitted signal
example:
speech part: noun
synonyms: booster amplifier booster station relay link relay station relay transmitter
definition: a thief who steals goods that are in a store
example:
speech part: noun
synonyms: shoplifter lifter
definition: someone who is an active supporter and advocate
example:
speech part: noun
synonyms: promoter plugger
definition: a person who backs a politician or a team etc.
example:
speech part: noun
synonyms: champion

booster is explained and pronounced

How booster is being used?