The word dispensable 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: 20
Highest Scoring Words With Friends™ Play In The Letters dispensable
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Seven Letter Word Alert: (62 words)
abseils, aediles, aidless, alpeens, alpines, aniseed, badness, baleens, beanies, bedless, bedpans, besides, biassed, bipedal, biplane, blessed, blissed, debases, denials, deplane, despise, diesels, disable, disease, dispels, edibles, elapsed, elapses, enabled, enables, endless, enseals, islands, lesbian, linseed, lipases, napless, palsied, palsies, paneled, pansies, penises, piebald, pieless, pinless, pleased, pleases, plebian, salines, seabeds, seaside, sepaled, silanes, snailed, spaniel, spelean, spinals, spindle, spinels, spleens, splined, splines