The word thankfulnesses 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: 27
Highest Scoring Words With Friends™ Play In The Letters thankfulnesses
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Seven Letter Word Alert: (73 words)
alkenes, anklets, annulet, ashless, assents, auklets, auletes, eluants, eluates, eluents, enfants, enseals, enthuse, ethanes, falsest, fankles, fastens, fatness, fennels, fetuses, flashes, flaunts, flenses, fleshes, fluents, flushes, funnels, funnest, hassles, hastens, hateful, hatfuls, hatless, hueless, hustles, kennels, lateens, leanest, leashes, lessens, lunates, lushest, neatens, nestles, netless, salutes, sateens, senates, sensate, sensual, slashes, sleuths, slushes, stashes, sulfate, sultans, sunhats, sunless, sunsets, suntans, talkees, taluses, tankful, tassels, tealess, teasels, tunnels, tussles, uneaten, unleash, unseals, unseats, useless