The word mastoidectomy 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: 25
Highest Scoring Words With Friends™ Play In The Letters mastoidectomy
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Seven Letter Word Alert: (66 words)
atomics, atomise, atomism, coadmit, coasted, codetta, coedits, comedos, commits, commode, cooties, costate, coyotes, cystoid, cystoma, cytomas, dacites, dammits, daytime, demotic, desmoma, diatoms, dictate, dimmest, dittoes, domatic, dotcoms, dotiest, emacity, eomyids, icedams, mastoid, midmost, miscode, misdate, mismade, mismate, modesty, mottoes, myotics, myotome, omitted, oocytes, osmotic, osteoid, osteoma, otocyst, samoyed, satiety, scammed, scatted, scooted, scotoma, society, sodomic, somatic, someday, statice, stomate, stymied, testacy, toasted, tomatos, tomcats, tomtoms, tootsie