The word semidetached 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 semidetached
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Seven Letter Word Alert: (48 words)
achiest, addicts, aitches, atheise, atheism, caddies, caddish, cheated, cheesed, chemist, chested, dacites, deadest, deadish, deashed, decades, decease, deceits, decides, dehisce, demated, demates, demised, deshade, diadems, ditched, ditches, emetics, headset, heisted, icedams, machete, maddest, matched, matches, mediate, misdate, misdeed, scathed, schemed, seceded, sedated, seethed, sheeted, steamed, teaches, techies, teddies