Sardina pilchardus vs pilchard

Sardina pilchardus and pilchard both are nouns.

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

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

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

Other synonyms of Sardina pilchardus include sardine.

Sardina pilchardus (noun)	pilchard (noun)
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