The word categorematic 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: 24
Highest Scoring Words With Friends™ Play In The Letters categorematic
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Seven Letter Word Alert: (39 words)
accrete, acerate, acetate, acreage, agamete, agitate, cacemia, cartage, cattier, ceramic, citator, citrate, cometic, coterie, cottage, cremate, emirate, emitter, erotica, etaerio, gametic, garotte, grimace, iterate, margate, meatier, migrate, octamer, omitter, racemic, ragtime, regatta, reimage, ricotta, teacart, teatime, termite, toccata, tritoma