The word sidesplitting 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: 21
Highest Scoring Words With Friends™ Play In The Letters sidesplitting
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Seven Letter Word Alert: (84 words)
delints, delists, dentils, dentist, designs, desilts, dieting, dietist, digests, dingies, dispels, dissent, dissing, distils, ditties, editing, eliding, elitist, enlists, gipsies, glinted, glisten, ignited, ignites, ileitis, indites, ingests, insides, insipid, insteps, letting, lignite, lisping, listens, listing, pelting, petting, pietist, piglets, pilings, pingled, pingles, pinless, pistils, pitless, pitting, setting, sidelit, sidings, sidling, signets, silents, silting, singled, singles, singlet, sitting, sliding, slitted, snidest, spindle, spinels, spinets, spiting, spitted, spittle, splined, splines, splints, stilted, stinted, stipend, stipite, testing, tidiest, tidings, tiepins, tilings, tilting, tingled, tingles, tiniest, tinsels, tipless