Scrabble Dictionary

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Yes, oasis is playable

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"Oasis" Definition

noun

A fertile or green spot in a desert or wasteland, made so by the presence of water.
A situation or place preserved from surrounding unpleasantness; a refuge: an oasis of serenity amid chaos.
A fertile or green area in an arid region (as a desert).
Something that provides refuge, relief, or pleasant contrast.