The word unvariedness 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: 20
Highest Scoring Words With Friends™ Plays In The Letters unvariedness
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Seven Letter Word Alert: (70 words)
adenine, adverse, advisee, adviser, advises, aniseed, assured, asunder, avenues, dearies, deniers, derives, desires, deveins, deviser, devises, dinners, disease, diverse, durians, endears, endives, endures, ensears, ensnare, ensured, ensures, enviers, evaders, innards, insaner, insured, insures, invader, invades, inverse, ravines, readies, redness, reissue, resands, resaved, resaves, resends, resides, residue, revised, revises, sanders, sandier, sardine, seaside, senders, siennas, sinners, sudsier, sundaes, sunnier, sunnies, sunrise, unaired, undines, undress, unnerve, unrisen, unsaved, unvaned, ureases, versine, viruses