The word internationalize cannot be made in Words With Friends™. It is 16 letters long, too long to fit on a WordsWithFriends board (15 letters max).
Highest Scoring Words With Friends™ Plays In The Letters internationalize
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Seven Letter Word Alert: (65 words)
aeolian, aileron, airline, alanine, aniline, antenna, antlion, arenite, areolae, elation, enolate, enolize, enteral, entitle, entrain, entrant, entreat, erotize, etaerio, eternal, inertia, initial, intoner, ionizer, iterate, lantern, latrine, lenient, lineate, lintier, lionize, nattier, neonate, nitrate, nitrene, nitrite, nittier, nonlate, nonliar, nonreal, onliner, otarine, ratline, rattail, realize, reliant, retinal, retinol, retitle, retotal, tentier, ternate, tertial, tinnier, tintier, toenail, trainee, trenail, triaene, tzarina, zealant, zelator, zeolite, zittern, zoarial