The word tightfistedness 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: 24
Highest Scoring Words With Friends™ Play In The Letters tightfistedness
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Seven Letter Word Alert: (78 words)
defines, deftest, deifies, deities, densest, dentist, designs, desists, destine, detents, detests, dieties, dietine, dieting, dietist, digests, dingies, dishing, dissent, dissing, ditties, edgiest, edifies, editing, feeding, feesing, feigned, fidgets, finesse, fishing, fishnet, fitness, fittest, fitting, genesis, heeding, hefting, heisted, hessite, hidings, hissies, hissing, hitting, ignited, ignites, indites, infests, ingests, insides, insight, insists, neighed, nightie, seeding, seitens, sestets, sestine, setting, shifted, shindig, sidings, sifting, sighted, signees, signets, sitting, snidest, stented, stinted, tensest, testing, theists, tidiest, tidings, tighten, tiniest, tithing, tsetses