The word theistical 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: 16
Highest Scoring Words With Friends™ Plays In The Letters theistical
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Seven Letter Word Alert: (26 words)
achiest, aitches, alethic, atheist, castile, chalets, chattel, chilies, ciliate, elastic, elicits, elitist, ethical, halites, ischial, italics, laciest, laicise, latches, latites, lattice, satchel, statice, stealth, tactile, thistle