The word traversable 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™ Play In The Letters
Seven Letter Word Alert: (51 words)
abaters, ablates, abraser, abreast, aerates, alerter, arblast, averral, averser, averter, barrels, barters, bearers, beaters, beavers, berates, beslave, blaster, bleater, bravest, brevets, eatable, elaters, laveers, leavers, realers, realest, realter, reavers, rebales, rebater, rebates, reblast, relater, relates, retears, reveals, reverbs, reverts, savable, serrate, servlet, several, stabler, starver, stealer, svelter, tearers, travels, trebles, verbals