The word cretinisms 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: 17
Highest Scoring Words With Friends™ Play In The Letters cretinisms
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Seven Letter Word Alert: (27 words)
cistern, citrine, cretins, iciness, incests, incises, inciter, incites, insects, inserts, interim, irenics, menisci, metrics, mincers, minters, mintier, miscite, misters, mistier, remints, seismic, sericin, sinters, smiters, stimies, termini