The word serological 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: 18
Highest Scoring Words With Friends™ Play In The Letters serological
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Seven Letter Word Alert: (51 words)
aerosol, aircell, aircool, alcogel, allegro, callers, callose, calorie, cargoes, cellars, celosia, coalers, coalier, coalise, collage, collars, collier, collies, coolers, corolla, corsage, creosol, eclairs, escolar, gaolers, garlics, glacier, glories, goalies, goosier, gorilla, gracile, grilles, locales, logical, ocellar, oracles, orioles, rallies, recalls, reclogs, recoals, recoils, regosol, rosalic, roseola, scalier, scleral, scoriae, scrooge, solacer