Yes, BOOSTERS is a Scrabble word!

Letter values in Scrabble US: B 3, O 1, O 1, S 1, T 1, E 1, R 1, S 1.

Is it a valid word?

Scrabble US: valid, 10 points.

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About BOOSTERS

BOOSTERS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

Definitions

noun

a person who backs a politician or a team etc.
someone who is an active supporter and advocate
a thief who steals goods that are in a store
an amplifier for restoring the strength of a transmitted signal
the first stage of a multistage rocket
an additional dose that makes sure the first dose was effective

Synonyms

Also: booster amplifier, booster station, relay link, relay station, relay transmitter, booster rocket, booster unit, takeoff booster, takeoff rocket, booster dose, booster shot, recall dose.

All synonyms of BOOSTERS