The word etymologist 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: 19
Highest Scoring Words With Friends™ Play In The Letters etymologist
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Seven Letter Word Alert: (20 words)
egotism, egotist, elogist, glottis, gooiest, moistly, motleys, mottles, mottoes, oolites, otolite, semilog, sootily, stoolie, testily, toilets, toolset, tootles, tootsie, tylotes