The word maintainers 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: 16
Highest Scoring Words With Friends™ Plays In The Letters maintainers
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Seven Letter Word Alert: (53 words)
airiest, airtime, amentia, amnesia, amritas, animate, animist, antsier, artisan, artsman, artsmen, asinine, atresia, entrain, inertia, inmates, insaner, interim, interns, irisate, manners, mantras, marinas, marines, martens, martian, martini, martins, minaret, miniate, minters, mintier, mistier, nastier, raiment, remains, remints, remnant, restain, retains, retinas, seminar, siriema, sirname, smarten, smartie, stainer, stamina, tanners, termini, tinners, tinnier, tsarina