The word vinaigrette 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: 18
Highest Scoring Words With Friends™ Plays In The Letters vinaigrette
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Seven Letter Word Alert: (44 words)
arenite, avenger, engrave, entreat, evitate, eviting, granite, grantee, greaten, igniter, inertia, ingrate, integer, invitee, inviter, iterate, nattier, nitrate, nitrite, nittier, ratting, reagent, reaving, reeving, tangier, tearing, tentage, tentier, ternate, tiering, tintier, trainee, treeing, triaene, vatting, vearing, veering, veinier, veteran, vetting, vinegar, vintage, vitiate, vitrine