The word etiologists 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: 14
Highest Scoring Words With Friends™ Play In The Letters etiologists
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Seven Letter Word Alert: (23 words)
egoists, egotist, elitist, elogist, glioses, gliosis, glottis, gooiest, goosies, iolites, loosest, oiliest, oligist, oolites, otolite, soloist, stogies, stooges, stoolie, toilets, toolset, tootles, tootsie