filefish vs plectognath fish

filefish and plectognath fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
filefish	Yes	No	No	No
plectognath fish	Yes	No	No	No

As nouns, plectognath fish is a hypernym of filefish; that is, plectognath fish is a word with a broader meaning than filefish:

filefish: narrow flattened warm-water fishes with leathery skin and a long file-like dorsal spine
plectognath fish: tropical marine fishes having the teeth fused into a beak and thick skin covered with bony plates or spines

Other hypernyms of filefish include plectognath.

filefish (noun)	plectognath fish (noun)
narrow flattened warm-water fishes with leathery skin and a long file-like dorsal spine	tropical marine fishes having the teeth fused into a beak and thick skin covered with bony plates or spines