The word commissariats 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 commissariats
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Seven Letter Word Alert: (34 words)
airmass, amritas, assarts, assorts, atomics, atomism, castors, commits, cosmism, costars, marmots, mascots, miasmas, miasmic, mimosas, misaims, miscast, missort, mitosis, mosaics, racisms, racists, sarcasm, sarcoma, satiric, scatoma, scissor, scorias, sitcoms, somatic, somitic, stroams, tarmacs, tsarism