The word rancidest 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: 14
Highest Scoring Words With Friends™ Play In The Letters rancidest
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Seven Letter Word Alert: (54 words)
antsier, arcsine, aridest, arsenic, astride, cairned, candies, canters, cantred, carnies, certain, cinders, cistern, credits, cretins, cristae, dacites, dancers, decants, descant, destain, detains, detrain, directs, discant, discern, disrate, drastic, incased, instead, nastier, nectars, raciest, radices, recants, redacts, rescind, restain, retains, retinas, sainted, sandier, sardine, scanter, sidecar, stained, stainer, stander, tinders, tirades, tradein, trained, tranced, trances