otb is a valid English word

Scrabble validity: invalid ( international - Sowpods, US - Twl06 )
iScramble validity: valid
QuickWords validity: valid

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Meanings

Adjective (NOT COMPARABLE)

Not comparable
    (chess) Initialism of: over-the-board.

otb is not a Scrabble valid word


otb is an iScramble valid word


otb is an QuickWords valid word


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Same letters words (Anagrams)


Same letters plus one


Same letters minus one