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The noun 'muster' is a standard collective noun for:
A muster of Crows and a muster of Peacocks
No, it is not a preposition. Muster is a noun, or a verb (to gather or muster).
Miki Muster's birth name is Miki Muster.
Muster parade. Muster means to gather everyone together in a parade, that's why it is called muster parade.