The word retailers 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: 10
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (30 words)
aeriest, alerter, artsier, earlier, elaters, realers, realest, realise, realist, realter, rearise, relater, relates, reliers, retails, retears, retiles, retires, retrial, retries, saltier, seriate, serrate, slatier, stealer, sterile, tarries, tearers, tearier, trailer