The word subtending 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 subtending
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Seven Letter Word Alert: (30 words)
bedungs, bending, besting, budgets, budgies, bunnies, bunting, busting, denting, dentins, dunites, dustbin, dusting, endings, ensuing, indents, intends, nesting, sending, stunned, subedit, subtend, tending, tensing, tubings, tunings, unbends, unbinds, undents, undines