The word oestradiol 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: 12
Highest Scoring Words With Friends™ Play In The Letters
Seven Letter Word Alert: (50 words)
aerosol, aridest, astride, astroid, delator, derails, details, dialers, dilater, dilates, dilator, disrate, disroot, editors, estriol, isolate, leotard, loaders, loiters, looters, oolites, ordeals, orioles, osteoid, realist, redials, reloads, retails, retools, roadies, roasted, roisted, roosted, roseola, saltier, slatier, soldier, sootier, sortied, steroid, stooled, stoolie, storied, tailors, tierods, tirades, toilers, toolers, toroids, trailed