The word endothermal 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: 19
Highest Scoring Words With Friends™ Plays In The Letters endothermal
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Seven Letter Word Alert: (62 words)
alerted, almoner, altered, amender, another, armhole, delator, demerol, dormant, earldom, earmold, earthed, earthen, emendal, emerald, enolate, enteral, enthral, eternal, ethanol, handler, headmen, healder, hearted, hearten, homered, leadeth, learned, leather, lemoned, leotard, loathed, loather, mandrel, manhole, mantled, meander, menorah, menthol, metaled, methane, modeler, mordant, mordent, rathole, reamend, redealt, rehomed, rehoned, related, remated, remodel, renamed, roadmen, telomer, theorem, thereon, thermal, thorned, throned, tonearm, treadle