The word helianthuses 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: 19
Highest Scoring Words With Friends™ Play In The Letters helianthuses
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Seven Letter Word Alert: (71 words)
ashiest, atheise, auletes, aulists, aunties, easiest, elastin, eluants, eluates, eluents, enlists, enseals, ensuite, entails, enthuse, ethanes, halites, hastens, hatless, healths, heathen, hessite, hueless, hustles, inhales, insults, inulase, lateens, leanest, leashes, lenites, lineate, listens, lunates, luniest, lushest, nailset, nestles, netless, salient, salines, salutes, sateens, seitans, seitens, senates, sensate, sensual, sestina, sestine, sheathe, sheaths, shutins, silanes, silents, sinuate, sleuths, sultans, sunhats, sustain, taluses, tealess, teasels, tensile, tieless, tinsels, unleash, unlists, unseals, unseats, utensil