The word characterise 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: 20
Highest Scoring Words With Friends™ Plays In The Letters characterise
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Seven Letter Word Alert: (91 words)
acaters, accites, accrete, acerate, achiest, aerates, aeriest, aitches, archaic, archers, arctics, artsier, ascetic, atheise, atresia, cachers, cachets, careers, carries, carters, caseate, cashier, catarrh, catcher, catches, caterer, cerates, charier, charter, chaster, cheater, cithers, crasher, craters, creaser, creates, creches, cristae, earache, erratic, etchers, etheric, hastier, hearers, heaters, hectare, heretic, hetaera, racecar, raciest, ratrace, reacher, reaches, rearise, recache, recatch, rechart, recheat, reciter, recites, recrate, rehears, reheats, rehires, reshare, retches, reteach, retears, retires, retrace, retries, richest, saccate, scarcer, scarier, scratch, screech, seriate, serrate, shearer, tarries, teacher, teaches, tearers, tearier, techies, terrace, tracers, trachea, trasher, triarch