The word crustaceans 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 crustaceans
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Seven Letter Word Alert: (45 words)
acaters, accents, accrues, accurse, accurst, accuser, accuses, actress, acuates, ancress, arctans, arcuate, ascents, aurates, cancers, canters, carcass, casters, causers, cauters, centaur, curates, encrust, natures, nectars, nutcase, recants, recasts, rescans, saccate, sanctus, saucers, saunter, scanter, searats, seastar, secants, stances, sucrase, sunstar, trances, uncarts, uncrate, unrests, unseats