The word moisturises 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 moisturises
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Seven Letter Word Alert: (45 words)
estrous, estrums, isomers, issuers, meiosis, missort, missuit, misters, mistier, misuser, misuses, mitoses, mitosis, moister, mortise, mossier, mousers, mousier, mousses, musters, mustier, oestrus, ousters, resists, rosiest, russets, serious, sissier, sisters, smiters, somites, sorties, sourest, stimies, stomies, stories, stourie, suiters, suitors, surmise, tissues, toruses, tossers, tourism, trusses