The word interleaves 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™ Plays In The Letters interleaves
:
Seven Letter Word Alert: (99 words)
aeriest, antlers, antsier, arenite, earnest, eastern, eeriest, elastin, elaters, elative, elevate, elevens, enslave, entails, enteral, entrees, entries, enviers, estival, eternal, evenest, evilest, inverse, inverts, lateens, latrine, laveers, leaners, leanest, leavens, leavers, lenites, lineate, nailers, nailset, naivest, nastier, natives, nearest, ratline, ravines, realest, realise, realist, relates, release, relents, reliant, relieve, relines, relives, renails, rentals, reslant, restain, restive, retails, retains, retiles, retinal, retinas, reveals, reviles, salient, saltern, saltier, seriate, servant, servile, servlet, several, sievert, slatier, stainer, stealer, steelie, sterane, sterile, sternal, striven, svelter, taverns, teenier, tensile, trainee, travels, trenail, triaene, trienes, vainest, veilers, veinlet, veneers, veneral, ventral, veritas, versine, veteran, vinelet