The word defibrillator 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: 22
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (97 words)
aborted, aborter, airfoil, airlift, alditol, arbiter, arbored, bedrail, bedroll, bifolia, biolite, bloated, bloater, boarder, bollard, braider, brailed, braille, bridler, broader, broiled, broiler, delator, deliria, deorbit, dialler, dilater, dilator, diorite, dirtier, drafter, driblet, drifter, driller, droller, fibrate, fibroid, filbert, filiate, firelit, flailed, flatbed, flirted, flirter, floated, floater, foliate, forbade, forbear, frailer, friable, frilled, illbred, labored, laborer, lardier, leotard, libated, libator, liberal, literal, lobated, lobelia, loftier, oilbird, oilfire, orbital, orbited, orbiter, rabider, rallied, rarebit, reallot, realtor, reboard, rebraid, redraft, redrill, refloat, retrial, roilier, rollbar, tabloid, tallied, tallier, tardier, tarried, trailed, trailer, trefoil, triable, trifled, trifler, trifold, trilled, trilobe, trolled