The word humanitarianism 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: 26
Highest Scoring Words With Friends™ Play In The Letters humanitarianism
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Seven Letter Word Alert: (33 words)
amanita, amastia, amritas, animism, animist, artisan, artsman, atriums, inhuman, inturns, manhunt, mannish, mantras, marinas, martian, martini, martins, minimas, minimus, misturn, rainhat, samurai, sariama, saurian, stamina, stannum, tarnish, thiamin, tramman, traumas, tsarina, tsunami, unstain