The word heulandites 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™ Play In The Letters heulandites
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Seven Letter Word Alert: (78 words)
aediles, aniseed, atheise, auditee, auletes, aunties, delates, delints, denials, dentals, dentils, destain, destine, details, detains, detinue, detunes, dilates, diluent, dilutes, dualise, dualist, duelist, dunites, elastin, eluants, eluated, eluates, eluents, ensuite, entails, enthuse, ethanes, halides, halites, handles, handset, haunted, headset, heisted, hustled, inhaled, inhales, instead, inulase, lateens, leadeth, leanest, leashed, lenited, lenites, lineate, linseed, lunated, lunates, luniest, nailset, nestled, nutseed, sainted, salient, saluted, sauteed, shunted, sinuate, slanted, snailed, stained, standee, sundial, tensile, undealt, unhated, unideal, unleash, unsated, untiled, utensil