The word rancidities 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: 16
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (84 words)
airiest, airside, antsier, arcsine, aridest, arsenic, astride, cairned, candies, canters, cantred, carnies, certain, cinders, cistern, citrine, credits, cretins, cristae, dacites, dairies, dancers, decants, deistic, denarii, descant, destain, detains, detrain, diaries, diarist, diciest, dietics, directs, dirties, discant, discern, disrate, ditsier, drastic, incased, incised, incited, inciter, incites, indices, indicts, inditer, indites, inertia, insider, instead, irenics, iridise, irisate, nastier, nectars, nitride, raciest, radices, recants, redacts, rescind, restain, retains, retinas, sainted, sandier, sardine, satiric, scanter, sericin, sidecar, stained, stainer, stander, tidiers, tinders, tirades, tradein, trained, tranced, trances, triadic