pilchard vs sardine

pilchard and sardine both are nouns.

Word	Noun	Adjective	Verb	Adverb
pilchard	Yes	No	No	No
sardine	Yes	No	No	No

As nouns, pilchard and sardine are synonyms defined as:

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

Other synonyms of pilchard include Sardina pilchardus.

As nouns, pilchard and sardine are synonyms defined as:

pilchard (noun)	sardine (noun)
small fishes found in great schools along coasts of Europe; smaller and rounder than herring	any of various small edible herring or related food fishes frequently canned
small fatty fish usually canned	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