The word subtreasuries 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™ Play In The Letters subtreasuries
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Seven Letter Word Alert: (83 words)
abusers, aeriest, arbiter, arbutus, arrests, artsier, asserts, assures, austere, auteurs, baiters, barites, barters, bassets, bassist, basters, bearers, beaters, berates, berries, biasses, braiser, braises, brasier, brasses, breasts, bruiser, bruises, bureaus, bursars, bursate, busiest, busters, bustier, easiest, erasers, erasure, euaster, issuers, raisers, rarebit, rasters, rearise, rebaits, rebases, rebater, rebates, rebites, reburst, reissue, reseats, resists, resters, restirs, retears, retires, retries, russets, rustier, sassier, satires, seaters, seriate, serrate, sierras, siestas, sisters, starers, subsets, subsist, subsite, subtree, suiters, sutures, tarries, tearers, tearier, teasers, tissues, tresses, trusses, ureases, ureters