The word connoisseur 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: 17
Highest Scoring Words With Friends™ Play In The Letters connoisseur
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Seven Letter Word Alert: (30 words)
censors, cession, coiners, cosines, courses, cousins, cronies, cruises, erosion, insures, ionones, neurons, nonuser, noosers, oncosis, onerous, recoins, reunion, seniors, serious, sinners, sooners, sources, sucrose, sunnier, sunnies, sunrise, uncross, unicorn, unrisen