The word systematisation 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 systematisation
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Seven Letter Word Alert: (66 words)
amasses, amenity, amentia, amnesia, amnesty, anatomy, animate, animist, animose, anytime, assents, atomise, atonias, attains, attests, etymons, imitate, inmates, inosite, inseams, insists, instate, ionises, isonyms, meiosis, miniate, missays, misseat, mission, mitiest, mitoses, mitosis, mittens, moisten, myosins, nosiest, notists, osseins, satiate, satiety, seamost, seasons, seitans, session, sestina, siestas, simians, smitten, somites, sonatas, stamens, stamina, statins, station, statism, statist, stetson, stimies, stomata, stomate, stomies, stymies, systems, taoists, tiniest, tomtits