The word secretiveness 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: 21
Highest Scoring Words With Friends™ Play In The Letters secretiveness
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Seven Letter Word Alert: (56 words)
censers, centers, centres, cerises, cistern, cresses, cresset, cretins, eeriest, enteric, enticer, entices, entrees, entries, enviers, essence, evenest, evictee, evinces, incests, insects, inserts, invects, inverse, inverts, invests, nesters, receive, recites, renests, resects, resents, resists, restive, revises, scenter, screens, secerns, secrete, secrets, seitens, service, sestine, sievert, sincere, sinters, sisters, stivers, striven, strives, teenier, tresses, trienes, veneers, verists, versine