The word irretrievably 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: 23
Highest Scoring Words With Friends™ Play In The Letters irretrievably
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Seven Letter Word Alert: (41 words)
ability, alerter, arbiter, averrer, averter, barrier, belayer, bilayer, biliary, bleater, bravely, bravery, brevity, earlier, elative, ilvaite, irately, liberty, library, rarebit, reality, realter, rebater, relater, relayer, retirer, retrial, revelry, reviler, rivalry, riveter, tarrier, tearier, tearily, terrier, trailer, triable, trivial, variety, veilier, vibrate