The word mortalities 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: 15
Highest Scoring Words With Friends™ Plays In The Letters mortalities
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Seven Letter Word Alert: (75 words)
airiest, airtime, altoist, armlets, artiest, atomise, attires, elitism, elitist, estriol, imitate, iolites, iratest, irisate, isolate, latites, limiter, litters, loamier, loiters, maestro, mailers, maltier, maltose, marlite, matters, metrist, militar, mistier, mistral, mitiest, moister, morales, mortals, mortise, motlier, mottler, mottles, oiliest, omitter, rattles, realism, realist, remails, retails, retilts, retoast, retotal, rotates, saltier, siltier, similar, siriema, slatier, slimier, slitter, smartie, smatter, smilier, starlet, starlit, startle, stilter, stomate, striate, stromal, tailors, tastier, tertial, tilters, toaster, toilers, toilets, tramels, tritoma