Synonyms for Monkfish (same or very similar meaning)
WordNet sense 1 (fishes having large mouths with a wormlike filament attached for luring prey):
angler, allmouth, anglerfish, goosefish, lotte, Lophius AmericanusWordNet sense 2 (sharks with broad flat bodies and winglike pectoral fins but that swim the way sharks do):
angelfish, angel shark, Squatina squatinaFrom the ODE community, based on WordNetadd/edit