The word abstrusities 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: 16
Highest Scoring Words With Friends™ Plays In The Letters abstrusities
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Seven Letter Word Alert: (65 words)
abusers, abutter, airiest, artiest, artists, asserts, assures, astuter, attires, autists, baiters, barites, bassets, bassist, basters, batters, battier, biasses, bitrate, bitsets, bitsier, bitters, bittier, braises, brasses, breasts, bruises, bursate, busiest, busters, bustier, butters, butties, iratest, irisate, issuers, ratbite, rebaits, resists, russets, sassier, satires, siestas, sissier, sisters, sitters, situate, staters, statues, stature, straits, stratus, striate, subsets, subsist, subsite, subtest, suiters, tasters, tastier, terabit, tissues, tribute, trusses, tsarist