The word disposables 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
Seven Letter Word Alert: (31 words)
abioses, abseils, adipose, aidless, albedos, aldoses, asepsis, biassed, biasses, bipedal, bipoles, blissed, blisses, bolides, deposal, despoil, dipoles, disable, dispels, dispose, lassies, lassoed, lassoes, lipases, palsied, palsies, piebald, sapless, sodless, soliped, spoiled