The word warehouseman 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: 22
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (38 words)
anomers, arsheen, awesome, enamors, enamour, enrheum, homerun, housane, humaner, manures, measure, menorah, meowers, moaners, neuroma, nowhere, oarsman, oarsmen, rehomes, rehones, rehouse, renames, reshown, ruesome, seaworm, seaworn, showman, showmen, surname, unaware, unhorse, unshare, unswear, unswore, washman, washmen, whereas, whereon