The word lobstermen 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 lobstermen
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Seven Letter Word Alert: (30 words)
benmost, boletes, bolster, bolters, bonelet, boneset, boreens, emoters, enrobes, entombs, estrone, lobster, melters, mentors, meronts, meteors, mobster, monster, noblest, omelets, reblent, relents, remelts, remotes, resmelt, roselet, smelter, telomer, trebles, tremble