The word viscountesses 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™ Plays In The Letters viscountesses
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Seven Letter Word Alert: (36 words)
cenotes, cession, coesite, consist, cosiest, cosines, cousins, covines, ensuite, entices, envious, evinces, incests, insects, invects, invests, nosiest, notices, novices, octenes, oecists, osseins, outsees, section, seitens, session, sestine, sinuses, stenose, suction, sunsets, tissues, tocsins, unstoic, viscous, voteens