The word lexicologists 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: 27
Highest Scoring Words With Friends™ Play In The Letters lexicologists
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Seven Letter Word Alert: (41 words)
cellist, closest, closets, coexist, colitis, collies, colossi, coolest, cooties, cosiest, coxitis, coxless, egoists, elicits, elogist, exotics, extolls, glioses, gliosis, gooiest, goosies, illites, illogic, iolites, loosest, loxotic, ocelots, oecists, oiliest, oligist, oolites, oolitic, ossicle, silicle, sixgill, sixties, solicit, soloist, stogies, stooges, stoolie