The word naturalistic 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: 18
Highest Scoring Words With Friends™ Plays In The Letters naturalistic
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Seven Letter Word Alert: (48 words)
actants, actuals, alicant, arctans, artisan, attains, austral, canular, canulas, carinal, cattail, cranial, crustal, cultist, curials, curtail, curtain, incrust, insular, intrust, intuits, italics, lacinia, lariats, lunaria, lunatic, natural, nautica, rattail, rituals, saltcat, satanic, satiric, saurian, starlit, straint, sultana, tactual, tantric, tartans, titanic, titular, transit, truants, truncal, tsarina, uncarts, urinals