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