European catfish vs Silurus glanis

European catfish and Silurus glanis both are nouns.

Word	Noun	Adjective	Verb	Adverb
European catfish	Yes	No	No	No
Silurus glanis	Yes	No	No	No

As nouns, European catfish and Silurus glanis are synonyms defined as:

European catfish and Silurus glanis: large elongated catfish of central and eastern Europe

Other synonyms of European catfish include sheatfish.

European catfish (noun)	Silurus glanis (noun)
large elongated catfish of central and eastern Europe	large elongated catfish of central and eastern Europe