The word seismological 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: 23
Highest Scoring Words With Friends™ Play In The Letters seismological
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Seven Letter Word Alert: (40 words)
aimless, alcogel, callose, calomel, celosia, coalise, coeloms, collage, collies, colossi, egoisms, gliomas, glioses, gliosis, goalies, goosies, icemass, illogic, imagoes, laicise, liaises, ligases, locales, logical, malices, meiosis, micella, miscall, missile, mosaics, ossicle, scillas, seismic, semilog, silicas, silicle, similes, slaloms, socials, solaces