sardius vs sardine

sardius and sardine both are nouns.

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

As nouns, sardius and sardine are synonyms defined as:

Other synonyms of sardius include sard.

sardius (noun)	sardine (noun)
a deep orange-red variety of chalcedony	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 fatty fish usually canned
	a deep orange-red variety of chalcedony