Ocean sunfish and Plectognath fish

Ocean sunfish noun - Among the largest bony fish; pelagic fish having an oval compressed body with high dorsal and anal fins and caudal fin reduced to a rudder-like lobe; worldwide in warm waters.

Plectognath fish and ocean sunfish are semantically related. In some cases you can use "Plectognath fish" instead a noun phrase "Ocean sunfish".

Plectognath fish noun - Tropical marine fishes having the teeth fused into a beak and thick skin covered with bony plates or spines.

Ocean sunfish and plectognath fish are semantically related. Sometimes you can replace phrase "Ocean sunfish" with "Plectognath fish", this phrases are similar.