The word systematizers 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 systematizers
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Seven Letter Word Alert: (84 words)
aeriest, artiest, artists, asserts, attires, azymite, easiest, emirate, emitter, essayer, estates, iratest, itemset, iterate, masters, mastery, matters, maziest, meatier, messier, metrise, metrist, metrize, missays, misseat, misters, reemits, remates, reseats, resists, resizes, restate, restems, retaste, reteams, retests, retimes, sassier, satiety, satires, seamers, seamier, seaters, seizers, seriate, seriema, sesames, sestets, setters, siamese, siestas, sisters, sitters, smartie, smatter, smiters, staters, statism, stayers, steamer, straits, streams, streamy, streets, striate, stymies, systems, tasters, tastier, teasers, teatime, termite, tersest, testers, testier, tresses, tsarism, tsarist, tsetses, tzarism, tzarist, yttrias, zestier, zymases