The word incomparably 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: 28
Highest Scoring Words With Friends™ Plays In The Letters incomparably
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Seven Letter Word Alert: (38 words)
acronym, acyloin, airplay, alimony, amiably, anaboly, animacy, anomaly, apronym, bairnly, balcony, bipolar, cambial, campily, campion, capably, carinal, clarion, claypan, coalbin, coalman, company, cornily, crabman, crampon, cranial, crayola, laminar, mailcar, marconi, mayoral, narcoma, parboil, paronym, pliancy, polaric, primacy, pyloric