The word opisthorchiasis 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™ Play In The Letters opisthorchiasis
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Seven Letter Word Alert: (42 words)
airship, apricot, assorts, cahoots, captors, carhops, casspir, castors, chariot, chassis, cohorts, costars, haptics, haricot, harpist, hatshop, isopach, ostrich, pachisi, pastors, piarist, porosis, porotic, portico, prootic, prosaic, racists, rapists, raspish, rhotics, satiric, schists, scissor, scorias, scorpio, scripts, sophtas, spastic, spirits, toparch, trophic, tropics