The word creditable is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 18
Highest Scoring Words With Friends™ Play In The Letters creditable
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Seven Letter Word Alert: (49 words)
alerted, altered, article, baldric, beadier, bedrail, belated, berated, bleated, bleater, bracted, brailed, caliber, calibre, carbide, catbird, catered, citable, citadel, cleared, created, debacle, debater, decabit, decibel, declare, decrial, deltaic, dialect, dilater, driblet, libated, radicel, radicle, reacted, rebaled, rebated, rebited, recital, recited, redealt, relaced, related, retiled, trailed, treacle, treadle, trebled, triable