The word gelatinous 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: 15
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (73 words)
agonies, agonise, agonist, agoutis, aiglets, anglist, augites, aunties, elastin, elating, elation, elogist, eloigns, eluants, elusion, eluting, elution, entails, gelatin, gelatos, genials, genital, glisten, gluiest, glutens, goalies, guineas, igneous, inulase, isolate, lasting, leantos, leasing, legions, ligates, lingoes, lionets, longest, lounges, lousing, lunates, luniest, lusting, nailset, onstage, ousting, outages, outgain, outings, outlies, outline, outsail, outsang, salient, salting, sealing, sealion, seating, singlet, sinuate, slating, tagline, tailgun, tangelo, tangles, teasing, tingles, toenail, tongues, ugliest, unagile, unstage, utensil