The word solemnities 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 solemnities
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Seven Letter Word Alert: (45 words)
elision, elitism, enlists, inosite, insoles, iolites, ionises, itemise, lenites, lesions, lioness, lionets, lionise, lionism, listens, meioses, meiosis, missile, mission, mitoses, mitosis, moisten, molests, nemesis, nestles, netless, nosiest, oiliest, omelets, onetime, osselet, seitens, sestine, siemens, silents, similes, somites, stenose, stimies, stomies, tensile, tieless, tinsels, toeless, tonsils