The word stretchiness 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: 18
Highest Scoring Words With Friends™ Plays In The Letters stretchiness
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Seven Letter Word Alert: (74 words)
censers, centers, centres, cerises, cistern, cithern, cithers, cittern, cresses, cresset, cretins, enteric, enticer, entices, entries, etchers, etheric, ethnics, heiress, heretic, hessite, hissers, hitters, incests, inchers, insects, inserts, neither, nesters, netters, recites, renests, resects, resents, reshine, resists, retches, retests, retints, richest, scenter, schists, screens, secerns, secrets, seitens, sestets, sestine, setters, shiners, shrines, sincere, sinters, sisters, sitters, streets, stretch, techies, tensest, tenters, tentier, tersest, testers, testier, tethers, theists, therein, thirsts, tinters, tithers, tresses, trienes, trisect, tsetses