The word internationalisation cannot be made in Words With Friends™. It is 20 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Plays In The Letters internationalisation
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Seven Letter Word Alert: (209 words)
aeolian, aerials, aerosol, aileron, airiest, airline, alanine, altoist, aniline, anneals, anoints, antenna, antlers, antlion, antsier, areolas, arsenal, artiest, artisan, asinine, atoners, atonias, atresia, attains, attires, attrist, attrite, elastin, elation, elision, elitist, ensnarl, entails, entrain, entrant, erosion, estriol, ileitis, inertia, initial, inlines, inosine, inosite, insaner, instant, instate, intents, interns, intoner, intones, intorts, introns, iolites, ioniser, ionones, iratest, irisate, ironies, isolate, lantern, lariats, latents, latites, latrine, leantos, liaison, linnets, lintier, lionets, lionise, litters, loaners, loiters, loonier, loonies, looters, lotions, nailers, nailset, nannies, nastier, nations, natters, nattier, nitrate, nitrite, nittier, noisier, nonanes, nonarts, noniron, nonlate, nonliar, nonreal, nonriot, nonsale, nonsane, norites, nostril, notator, notions, oiliest, oleosin, onliner, oolites, oration, orients, orioles, orleans, otarine, otolite, rations, ratline, rattail, rattles, rattons, rattoon, realist, reliant, reloans, renails, rennins, rentals, reslant, restain, retails, retains, retilts, retinal, retinas, retinol, retints, retoast, retools, retotal, risotto, rootlet, roseola, rotates, salient, saltate, saltern, saltier, satiate, sealant, sealion, senator, siltier, sirloin, slatier, slitter, snotter, sootier, stainer, starlet, starlit, startle, station, sternal, stilter, stonier, stoolie, straint, striate, tailors, talents, tanners, tannest, tannins, tartans, tartest, tartlet, tastier, tatters, tattier, tattler, tattles, tattoos, tenants, tension, tertial, tilters, tiniest, tinners, tinnier, tinters, tintier, titlist, titrate, titters, toaster, toenail, toilers, toilets, toolers, toolset, toonies, tooters, tootler, tootles, tootsie, tornote, torsion, totters, transit, treason, trenail, triones, tsarina