Carassius auratus vs goldfish

Carassius auratus and goldfish both are nouns.

Word	Noun	Adjective	Verb	Adverb
Carassius auratus	Yes	No	No	No
goldfish	Yes	No	No	No

As nouns, Carassius auratus and goldfish are synonyms defined as:

Carassius auratus and goldfish: small golden or orange-red freshwater fishes of Eurasia used as pond or aquarium fishes

Carassius auratus (noun)	goldfish (noun)
small golden or orange-red freshwater fishes of Eurasia used as pond or aquarium fishes	small golden or orange-red freshwater fishes of Eurasia used as pond or aquarium fishes