boosters ( synonym found)
Definition of boosters:

(n) : something that boosts; the first stage of a multistage rocket that provides the thrust for liftoff and the initial flight
"when did you get your last tetanus booster?"
Definition of boosters:

(n) : something that boosts; the first stage of a multistage rocket that provides the thrust for liftoff and the initial flight
"when did you get your last tetanus booster?"
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