The word asteroidal 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: 12
Highest Scoring Words With Friends™ Plays In The Letters asteroidal
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Seven Letter Word Alert: (45 words)
aerials, airdate, aliased, areolas, aridest, astride, astroid, atresia, delator, derails, details, dialers, dilater, dilates, dilator, disrate, editors, estriol, isolate, lariats, leotard, loaders, loiters, ordeals, radials, radiate, realist, redials, reloads, retails, roadies, roasted, roisted, saltier, slatier, soldier, sortied, steroid, storied, tailors, tiaraed, tierods, tirades, toilers, trailed