The word repellants 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: 16
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (63 words)
alpeens, antlers, earnest, eastern, elaters, enteral, entraps, eternal, lateens, leaners, leanest, leapers, nearest, pallets, palters, panters, parents, pellets, pelters, petrels, planers, planets, planter, plaster, platers, pleaser, prelate, presale, presell, present, pretans, realest, relapse, relates, relents, rentals, repanel, repaste, repeals, repeats, repents, replane, replans, replant, replate, repleat, reslant, respell, respelt, retapes, retells, saltern, serpent, spaller, spelean, speller, stapler, stealer, stellar, sterane, sternal, tellers, trepans