The word eucalyptuses 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: 23
Highest Scoring Words With Friends™ Plays In The Letters eucalyptuses
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Seven Letter Word Alert: (51 words)
acetyls, acutely, alecups, aspects, auletes, auscult, capless, caplets, capsule, castles, catsups, clauses, cupless, cupulae, cupulas, cupules, cuspate, cypsela, ecstasy, ectypes, elapses, eluates, epaulet, escapes, euclase, eustacy, eustasy, eustely, eustyle, eyecups, lupuses, lysates, pastels, pestles, petless, pleases, pulsate, pustule, salutes, sculpts, selects, specula, staples, steeply, sulcate, suspect, taluses, teacups, tealess, teasels, upscale