The word thermionics 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: 20
Highest Scoring Words With Friends™ Play In The Letters thermionics
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Seven Letter Word Alert: (82 words)
chemist, chromes, cistern, cithern, cithers, citrine, citrons, coheirs, coiners, cornets, cretins, crimson, cronies, eosinic, erotics, ethnics, hermits, heroics, heroins, heroism, histone, homiest, hornets, ichnite, iconism, iconist, inchers, incisor, inciter, incites, incomer, incomes, inherit, inosite, inshore, interim, ioniser, irenics, ironies, itchier, meiotic, menisci, mentors, meronts, metrics, microns, mincers, minters, mintier, miscite, miscoin, mistier, moisten, moister, monster, mortise, mothers, noisier, norites, notcher, notches, notices, orients, ostrich, recoins, remints, rhotics, richest, section, sericin, shinier, shorten, smother, somitic, stonier, termini, thermic, thermos, thiones, thrones, torches, triones