Silurus glanis vs silurid fish

Silurus glanis and silurid fish both are nouns.

Word	Noun	Adjective	Verb	Adverb
Silurus glanis	Yes	No	No	No
silurid fish	Yes	No	No	No

As nouns, silurid fish is a hypernym of Silurus glanis; that is, silurid fish is a word with a broader meaning than Silurus glanis:

Silurus glanis: large elongated catfish of central and eastern Europe
silurid fish: Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin

Other hypernyms of Silurus glanis include silurid.

Silurus glanis (noun)	silurid fish (noun)
large elongated catfish of central and eastern Europe	Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin