The word anagrammatising 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: 27
Highest Scoring Words With Friends™ Play In The Letters anagrammatising
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Seven Letter Word Alert: (58 words)
against, agarans, airings, amanita, amastia, amritas, anagram, anginas, animism, animist, arising, artisan, artsman, gaining, gaiting, gastrin, girning, grating, griming, imaging, ingrain, maiming, mantras, margins, marinas, martian, martini, martins, matings, migrant, minimas, minting, misting, raining, raising, ramming, ranging, ranting, ratings, rimming, ringgit, ringing, ringman, rinsing, sangria, sariama, signing, singing, smiting, snaring, staging, stamina, staring, tangram, timings, tinging, tramman, tsarina