sardine vs brisling

sardine and brisling both are nouns.

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

As nouns, brisling is a hyponym of sardine; that is, brisling is a word with a more specific, narrower meaning than sardine:

sardine: any of various small edible herring or related food fishes frequently canned
brisling: small herring processed like a sardine

Other hyponyms of sardine include sild, Clupea sprattus, sprat.

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