The word defectiveness 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 defectiveness
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Seven Letter Word Alert: (42 words)
deceits, deceive, decenes, defects, defence, defense, defines, densest, descent, destine, deveins, devests, devices, devisee, devises, dissect, dissent, divests, endives, enticed, entices, essence, evenest, evicted, evictee, evident, evinced, evinces, festive, finesse, fitness, incests, infects, infests, insects, invects, invests, scented, secedes, seitens, sestine, snidest