sardine vs Sardina pilchardus

sardine and Sardina pilchardus both are nouns.

Word	Noun	Adjective	Verb	Adverb
sardine	Yes	No	No	No
Sardina pilchardus	Yes	No	No	No

As nouns, sardine and Sardina pilchardus are synonyms defined as:

sardine and Sardina pilchardus: small fishes found in great schools along coasts of Europe; smaller and rounder than herring

Other synonyms of sardine include pilchard.

sardine (noun)	Sardina pilchardus (noun)
any of various small edible herring or related food fishes frequently canned	small fishes found in great schools along coasts of Europe; smaller and rounder than herring
small fishes found in great schools along coasts of Europe; smaller and rounder than herring
small fatty fish usually canned
a deep orange-red variety of chalcedony