The word nonthermal 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 nonthermal
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Seven Letter Word Alert: (22 words)
almoner, another, armhole, enthral, ethanol, lantern, loather, manhole, menorah, menthol, montane, nonamer, nonlate, nonmale, nonmate, nonmeal, nonmeat, nonreal, rathole, remnant, thermal, tonearm