The word legalisation 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™ Play In The Letters
Seven Letter Word Alert: (87 words)
aeolian, against, agatine, agatise, agnosia, agonies, agonise, agonist, aiglets, aisling, analogs, anglist, atonias, elastin, elating, elation, elision, elogist, eloigns, entails, galenas, gallant, gallate, galleon, gallons, gelatin, gelatos, genials, genital, glisten, goalies, ignites, illites, inosite, install, instill, intagli, iolites, isolate, lasagne, lasting, leantos, leasing, legions, lentils, liaison, ligates, lignite, lilting, lingoes, lintels, lionets, lionise, listing, longest, nailset, oiliest, oligist, onstage, sailing, salient, salting, sealant, sealing, sealion, seating, selling, silting, singlet, slating, soiling, stollen, tagline, tailing, tallies, tangelo, tangles, teasing, telling, tilings, tillage, tilling, tingles, toenail, toiling, tollage, tolling