The word crustaceous 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: 19
Highest Scoring Words With Friends™ Play In The Letters crustaceous
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Seven Letter Word Alert: (45 words)
accosts, accrues, accurse, accurst, accuser, accuses, acerous, actress, arouses, auteurs, carouse, casters, castors, causers, cauters, coarcts, coaster, corsets, costars, courses, couture, cuatros, curates, escorts, estrous, oestrus, ousters, outrace, raucous, recasts, recoats, saucers, scouter, sectors, soccers, sources, sourest, stuccos, succors, succour, sucrase, sucrose, sutures, toruses, urostea