The word disaccharidases 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: (49 words)
acacias, acrasid, address, airhead, airside, arcades, archaea, archaic, ascarid, cachers, caddies, caddish, carcass, cardiac, cascade, cashers, cashier, chaired, chaises, charade, chasers, chassis, cheddar, cicadas, crashed, crashes, dairies, daisied, daisies, dashers, deadish, decadic, diacids, diaries, diehard, dihedra, discard, discase, hissers, hissier, hissies, ischiac, radices, reddish, sassier, shaders, shadier, sidecar, sissier