The word contentiousness 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: 22
Highest Scoring Words With Friends™ Play In The Letters contentiousness
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Seven Letter Word Alert: (62 words)
cenotes, cession, coesite, connote, consent, consist, content, contest, cooties, cosiest, cosines, cottons, cousins, ensuite, entices, incense, incests, insects, intense, intents, intones, ionones, noncute, nonenes, nonsuit, nosiest, notices, notions, notists, octenes, oecists, oncosis, oneness, osseins, osseous, osteons, outsees, outsets, outsits, section, seitens, session, sestets, sestine, sinuses, sonnets, soonest, stenose, stetson, suction, sunnies, sunsets, tensest, tension, teutons, tissues, tocsins, toonies, tootsie, tsetses, unction, unstoic