The word conchologists 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: 25
Highest Scoring Words With Friends™ Plays In The Letters conchologists
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Seven Letter Word Alert: (36 words)
closing, cocoons, colonic, colossi, coltish, consist, cooling, cosigns, costing, gnocchi, gnostic, goosish, gothics, hooting, hosting, isogons, longish, loosing, looting, losings, lotions, oncosis, oncotic, ooliths, oolongs, schools, shooing, slights, soloing, soloist, sooting, stonish, tocsins, tonsils, tooling, tossing