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OB
Ob (noun) — a major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea. 2. (noun) the branch of medicine dealing with childbirth and care of the mother.
Ob is a valid 2-letter word worth 4 points in Scrabble (and Words With Friends letter values vary). Below are its anagrams and the shorter words hidden inside it.