The word internationalization 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™ Play In The Letters internationalization
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Seven Letter Word Alert: (62 words)
aeolian, aileron, airline, alanine, aniline, antenna, antlion, attrite, elation, entrain, entrant, inertia, initial, intoner, ionizer, lantern, latrine, lintier, lionize, loonier, nattier, nitrate, nitrite, nittier, noniron, nonlate, nonliar, nonreal, nonriot, nonzero, notator, onliner, oration, otarine, otolite, ozonate, ratline, rattail, rattoon, reliant, retinal, retinol, retotal, rootlet, tartlet, tattier, tattler, tertial, tinnier, tintier, titrate, toenail, tootler, tornote, trenail, tzarina, zealant, zelator, zittern, zoarial, zoolite, zootier