The word thermoelectric 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: 26
Highest Scoring Words With Friends™ Play In The Letters thermoelectric
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Seven Letter Word Alert: (50 words)
cheerer, cheerio, chimere, choicer, choleic, chortle, chromel, chromic, circler, circlet, clitter, clotter, coercer, coherer, cometic, correct, coterie, critter, crochet, elector, emitter, erecter, erector, etheric, heretic, leecher, leerier, miterer, motlier, mottler, omitter, rechime, reciter, reelect, reerect, remoter, retimer, retiree, retitle, teether, telecom, telomer, termite, theorem, thereto, thermic, thorite, treelet, trireme, trochee