The word housemaster 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: 17
Highest Scoring Words With Friends™ Plays In The Letters housemaster
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Seven Letter Word Alert: (61 words)
arouses, assumer, austere, authors, earshot, emoters, estrous, estrums, euaster, hamster, hearses, heaters, heteros, maestro, marshes, mashers, masseur, masters, matures, measure, meshers, meteors, mothers, mousers, mushers, musters, oestrus, ousters, outsees, rashest, reheats, rehomes, rehouse, remates, remotes, reseats, reshoes, restems, resumes, reteams, roseate, ruesome, seamers, seamost, seaters, shouter, smasher, smother, sourest, steamer, stereos, streams, stroams, teasers, temurah, theorem, thermos, toruses, trashes, ureases, urostea