The word ethologists 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: 16
Highest Scoring Words With Friends™ Play In The Letters ethologists
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Seven Letter Word Alert: (34 words)
egoists, egotist, elogist, ghettos, glioses, glottis, gooiest, goosies, goosish, gothite, hogties, holiest, hostels, hostile, isohels, loosest, oolites, ooliths, otolite, otolith, sleighs, sleight, slights, soloist, soothes, stogies, stooges, stoolie, theists, thistle, toilets, toolset, tootles, tootsie