The word gelatinising 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™ Plays In The Letters gelatinising
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Seven Letter Word Alert: (59 words)
aiglets, aisling, angling, anglist, aniline, antigen, asinine, elastin, elating, entails, gaining, gaiting, gelatin, genials, genital, gentian, ginseng, glisten, ignites, ileitis, initial, inlines, intagli, lasting, leaning, leasing, lensing, ligates, lignins, lignite, linings, linnets, listing, nailing, nailset, nesting, sailing, salient, salting, sealing, seating, sieging, signage, signing, silting, singing, singlet, slating, snaggle, sniggle, staging, tagline, tailing, tangles, teasing, tensing, tilings, tinging, tingles