The word monotheistic 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: 21
Highest Scoring Words With Friends™ Plays In The Letters monotheistic
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Seven Letter Word Alert: (38 words)
chemist, contest, cooties, cottons, emotion, eosinic, ethnics, histone, homiest, ichnite, iconism, iconist, incites, incomes, inosite, meiotic, menisci, miscite, miscoin, mitiest, mitotic, mittens, moisten, mooches, motions, mottoes, noisome, notches, notices, osmotic, section, smitten, somitic, thiones, tiniest, titmice, toonies, tootsie