filefish vs plectognath

filefish and plectognath both are nouns.

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

As nouns, plectognath is a hypernym of filefish; that is, plectognath 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: 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 fish.

filefish (noun)	plectognath (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