The word pyrrhotites 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: 18
Highest Scoring Words With Friends™ Play In The Letters pyrrhotites
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Seven Letter Word Alert: (38 words)
history, hitters, horsier, hosiery, isohyet, isotype, pettish, porters, pothers, potters, pottery, potties, presort, protest, protist, pyrites, reports, retorts, rhetors, rioters, roister, ropiest, rosehip, rotters, shitpot, shorter, spotter, striper, stripey, strophe, thirsty, thorite, tipster, tiptoer, tiptoes, tithers, tropist, tryster