The word denaturants 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: 15
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (41 words)
andante, astuter, asunder, attends, attuned, attunes, aurates, dataset, entrant, entrust, natters, natured, natures, nutters, saunter, stander, started, statued, stature, student, stunned, stunner, stunted, stunter, tanners, tannest, tartans, taunted, taunter, tautens, tenants, tetanus, truants, trusted, tundras, undents, undrest, unearnt, unrated, unsated, untread