The word housemasters 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: 18
Highest Scoring Words With Friends™ Plays In The Letters
Seven Letter Word Alert: (74 words)
arouses, asserts, assorts, assumer, assumes, assures, austere, authors, earshot, emoters, estrous, estrums, euaster, hamster, hearses, heaters, heteros, hostess, maestro, marshes, mashers, masseur, masters, matures, measure, meshers, meteors, mothers, mousers, mousses, mushers, musters, oestrus, ousters, outsees, rashest, reheats, rehomes, rehouse, remates, remotes, reseats, reshoes, restems, resumes, reteams, roseate, ruesome, russets, seamers, seamost, seaters, sesames, shouter, smasher, smashes, smother, sourest, stashes, steamer, stereos, streams, stroams, teasers, temurah, theorem, thermos, toruses, tossers, trashes, tresses, trusses, ureases, urostea