The word marinates 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: 13
Highest Scoring Words With Friends™ Play In The Letters marinates
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Seven Letter Word Alert: (32 words)
amentia, amnesia, amritas, animate, antsier, artisan, artsman, artsmen, atresia, inmates, mantras, marinas, marines, martens, martian, martins, minaret, minters, nastier, raiment, remains, remints, restain, retains, retinas, seminar, sirname, smarten, smartie, stainer, stamina, tsarina