The word helianthemums 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: 26
Highest Scoring Words With Friends™ Play In The Letters helianthemums
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Seven Letter Word Alert: (70 words)
ailment, aliment, amentum, ammines, amulets, anthems, atheise, atheism, auletes, aunties, elastin, eluants, eluates, eluents, emulant, emulate, emulsin, enamels, ensuite, entails, enthuse, ethanes, haemins, halites, hamlets, healths, heathen, heliums, helmets, hemline, humites, immense, inhales, inmates, inulase, laments, lateens, leanest, lenites, lineate, lunates, luniest, mailmen, mantels, mantles, matinee, meanest, meanies, mensual, methane, minuets, minutes, mismate, misname, mistune, munites, nailset, netmail, nutmeal, salient, seminal, sheathe, sinuate, summate, tensile, tsunami, unleash, unmates, unsmelt, utensil