The word headmasters 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™ Play In The Letters headmasters
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Seven Letter Word Alert: (62 words)
adheres, aerated, aerates, amassed, ashamed, dashers, dearest, dearths, deashes, demasts, demates, deserts, dessert, dharmas, earthed, hamster, hardest, hatreds, headers, headset, hearsed, hearses, hearted, heaters, herdess, hetaera, marshes, mashers, masters, meshers, rashest, readmes, reasted, redates, reheats, remated, remates, reseats, restems, reteams, seamers, searats, seastar, seaters, sedater, sedates, shaders, sheared, smarted, smashed, smasher, smeared, stashed, steamed, steamer, streams, tasered, teasers, threads, trashed, trashes, tressed