The word systematising 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 systematising
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Seven Letter Word Alert: (66 words)
amenity, amnesty, animist, anytime, assents, assigns, enigmas, gamiest, gayness, gneissy, gymnast, ignites, imagine, imitate, ingests, inmates, inseams, insists, instate, magnets, massing, matings, matting, messing, miniate, mintage, missays, misseat, missing, misting, mitiest, mittens, sagiest, sassing, satiety, sayings, seaming, seating, seitans, sestina, setting, siestas, sigmate, signets, simians, sitting, smiting, smitten, stamens, stating, statins, statism, staying, stigmas, stimies, stygian, stymies, syntagm, systems, tasting, teaming, teasing, testing, timings, tiniest, yessing