The word pearlworts 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: 17
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (39 words)
apostle, palters, parlors, paroles, parrots, patrols, petrols, plaster, platers, plowers, plowter, portals, porters, postwar, praetor, praters, presort, prorate, prowler, raptors, realtor, replots, replows, reports, reroast, restrap, retraps, rewraps, rewrapt, roaster, rostral, sapwort, seaport, sparrow, stapler, tarrows, trawler, trowels, warpers