The word moisturise 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: 14
Highest Scoring Words With Friends™ Play In The Letters moisturise
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Seven Letter Word Alert: (35 words)
estrous, estrums, isomers, meiosis, missort, missuit, misters, mistier, misuser, mitoses, mitosis, moister, mortise, mossier, mousers, mousier, musters, mustier, oestrus, ousters, rosiest, serious, smiters, somites, sorties, sourest, stimies, stomies, stories, stourie, suiters, suitors, surmise, toruses, tourism