The word categorises 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™ Play In The Letters categorises
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Seven Letter Word Alert: (69 words)
acerose, actress, aeriest, aigrets, ascites, cagiest, cargoes, casters, castors, cerates, cerises, coaster, coesite, corsage, corsets, cosiest, costars, coterie, creases, creates, cresset, cristae, easiest, egoists, erotica, erotics, erotise, escorts, etaerio, gaiters, gassier, gastric, gearset, goatees, goiters, goitres, goriest, greases, oecists, raciest, racists, recasts, recites, recoats, reseats, resects, restage, roseate, rosiest, sagiest, satires, scoriae, scorias, seagoer, seaters, secrets, sectors, seriate, soirees, sorties, stagers, stagier, stereos, stogies, storage, stories, teasers, tigress, triages