The word complainer 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: 21
Highest Scoring Words With Friends™ Play In The Letters complainer
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Seven Letter Word Alert: (47 words)
aileron, almoner, caliper, calorie, campier, campion, carmine, claimer, clamper, clarion, coalier, coalmen, compare, compile, corneal, crampon, crimple, impaler, impanel, implore, incomer, inplace, lempira, loamier, manlier, marconi, mineral, miracle, moraine, opaline, palmier, panicle, pelican, pemican, plainer, polaric, polemic, porcine, praline, proline, reclaim, reclamp, replica, repoman, romaine, romance, ropeman