The word tessellation 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: 15
Highest Scoring Words With Friends™ Plays In The Letters tessellation
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Seven Letter Word Alert: (75 words)
altoist, easiest, elastin, elation, enlists, enolase, enolate, enseals, entails, entitle, estates, illness, insoles, install, instate, isolate, lateens, latents, latites, leanest, leantos, lenites, lentils, lesions, lineate, lintels, lioness, lionets, listens, nailset, neatest, nestles, netless, nettles, nosiest, notists, oleates, osselet, salient, salines, sateens, sealion, seitans, seitens, senates, sensate, sestina, sestine, settles, silanes, silents, stalest, stanols, statins, station, stenose, stetson, stollen, talents, tallest, tallies, taoists, tealess, teasels, teleost, tellies, telnets, tensest, tensile, tieless, tinsels, toeless, toenail, toilets, tonsils