The word deceptiveness 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: 25
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (54 words)
cesspit, deceits, deceive, decenes, deepens, deepest, densest, depicts, descent, despise, despite, destine, deveins, devests, devices, devisee, devises, discept, dissect, dissent, divests, endives, enticed, entices, epicene, essence, evenest, evicted, evictee, evident, evinced, evinces, incests, insects, inspect, insteps, invects, invests, pectens, pectins, penises, pensive, scented, secedes, seitens, septics, sestine, snidest, species, spinets, steeped, steepen, stipend, teepees