The word gelatinises 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: (77 words)
ageless, aiglets, aisling, anglist, eaglets, easiest, elastin, elating, elegant, elegist, elegits, enlists, enseals, entails, gelates, gelatin, genesis, genials, genital, gentile, gentles, glisten, ignites, ingests, intagli, lasting, lateens, leanest, leasing, legates, lenites, liaises, ligases, ligates, lignite, lineage, lineate, listens, listing, nailset, negates, nestles, netless, sagiest, sailing, salient, salines, salting, sateens, sealing, seating, seitans, seitens, senates, sensate, sestina, sestine, signals, signees, signets, silanes, silents, silting, singles, singlet, slating, tagline, tailing, tangles, tealess, teasels, teasing, tensile, tieless, tilings, tingles, tinsels