The word ornithologists 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: 20
Highest Scoring Words With Friends™ Play In The Letters ornithologists
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Seven Letter Word Alert: (62 words)
girlish, gliosis, glottis, goosish, grottos, hissing, hitting, hooting, horsing, hosting, ignitor, insight, intorts, isogons, listing, longish, loosing, looting, losings, lotions, nostril, notists, oligist, ooliths, oolongs, origins, otolith, rioting, risings, risotto, roiling, rooting, rotting, shooing, shoring, signors, silting, sirloin, sitting, slights, soiling, soloing, soloist, sooting, sorghos, sorting, stonish, storing, strings, thirsts, throngs, tigrish, tilings, tilting, tithing, toiling, tonight, tonsils, tooling, tooting, torsion, tossing