Scrabble Dictionary

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Yes, ouster is playable

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"Ouster" Definition

noun

Law The act of forcing one out of possession or occupancy of material property to which one is entitled; illegal or wrongful dispossession.
One that ejects, forces out, or supplants another.
The act of ejecting, forcing out, or supplanting.
The state of being ejected, forced out, or supplanted.
A judgment removing an officer or depriving a corporation of a franchise.