The word thyronines 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: 16
Highest Scoring Words With Friends™ Play In The Letters thyronines
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Seven Letter Word Alert: (25 words)
heroins, histone, history, honesty, hornets, hosiery, inshore, interns, intoner, intones, introns, isohyet, norites, orients, shorten, stonier, syntone, tension, thinner, thiones, thrones, tinhorn, tinners, triones, triynes