Scrabble Dictionary

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Yes, muster is playable

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"Muster" Definition

noun

A flock of peacocks. See Synonyms at flock1.
A gathering or collection: a muster of business leaders at a luncheon.
A gathering, especially of troops, for service, inspection, review, or roll call.
A muster roll.
The persons assembled for such a gathering.

phrasal-verb

Muster in To enlist or be enlisted in military service: She mustered in at the age of 18.
Muster out To discharge or be discharged from military service: He was mustered out when the war ended.

idiom

Pass muster To be judged as acceptable.

verb-intransitive

To assemble or gather: mustering for inspection.

verb-transitive

To call (troops) together, as for inspection.
To call forth; summon up: mustering up her strength for the ordeal. See Synonyms at call.
To cause to come together; gather: Bring all the volunteers you can muster.