The word peroxidases 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: 22
Highest Scoring Words With Friends™ Play In The Letters peroxidases
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Seven Letter Word Alert: (57 words)
adipose, asperse, aspired, aspires, axseeds, dearies, deepsix, deposer, deposes, depress, desires, despair, despise, diapers, disease, dispose, dossier, episode, epoxide, epoxied, epoxies, exordia, expired, expires, exposed, exposer, exposes, express, oxidase, paresis, periods, poesies, praised, praises, preside, pressed, proxied, proxies, radixes, readies, reposed, reposes, resides, respade, roadies, seaside, serapes, soapers, soapier, soirees, spaders, speared, spiders, spireas, spreads, xeroses, xerosis