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REM
Rem (noun) — a recurring sleep state during which dreaming occurs; a state of rapidly shifting eye movements during sleep. 2. (noun) (Roentgen Equivalent Man) the dosage of ionizing radiation that will cause the same amount of injury to human tissue as 1 roentgen of X-rays.
Rem is a valid 3-letter word worth 5 points in Scrabble (and Words With Friends letter values vary). Below are its anagrams and the shorter words hidden inside it.