The word psephologists 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: 24
Highest Scoring Words With Friends™ Plays In The Letters psephologists
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Seven Letter Word Alert: (49 words)
egoists, elogist, epilogs, glioses, glosses, gooiest, goosies, goosish, gospels, gossips, hippest, hogties, holiest, hoplite, hopples, hostels, hostess, hostile, isohels, isotope, loosest, oolites, ooliths, opposes, piglets, pisspot, pistols, pitless, plights, possets, postils, pothole, potpies, sleighs, sleight, slights, sloshes, soloist, soothes, spigots, stipple, stogies, stooges, stoolie, tipless, tipples, topless, topples, topsoil