herring vs Clupea harangus

herring and Clupea harangus both are nouns.

Word	Noun	Adjective	Verb	Adverb
herring	Yes	No	No	No
Clupea harangus	Yes	No	No	No

As nouns, herring and Clupea harangus are synonyms defined as:

herring and Clupea harangus: commercially important food fish of northern waters of both Atlantic and Pacific

herring (noun)	Clupea harangus (noun)
commercially important food fish of northern waters of both Atlantic and Pacific	commercially important food fish of northern waters of both Atlantic and Pacific
valuable flesh of fatty fish from shallow waters of northern Atlantic or Pacific; usually salted or pickled