The word healthiness 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: 17
Highest Scoring Words With Friends™ Plays In The Letters healthiness
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Seven Letter Word Alert: (42 words)
ashiest, atheise, easiest, elastin, enlists, enseals, entails, ethanes, halites, hastens, hatless, healths, heathen, hessite, inhales, lateens, leanest, leashes, lenites, lineate, listens, nailset, nestles, netless, salient, salines, sateens, seitans, seitens, senates, sensate, sestina, sestine, sheathe, sheaths, silanes, silents, tealess, teasels, tensile, tieless, tinsels