caviare vs roe

caviare and roe both are nouns.

Word	Noun	Adjective	Verb	Adverb
caviare	Yes	No	No	No
roe	Yes	No	No	No

As nouns, roe is a hypernym of caviare; that is, roe is a word with a broader meaning than caviare:

caviare: salted roe of sturgeon or other large fish; usually served as an hors d'oeuvre
roe: fish eggs or egg-filled ovary; having a grainy texture

Other hypernyms of caviare include hard roe.

caviare (noun)	roe (noun)
salted roe of sturgeon or other large fish; usually served as an hors d'oeuvre	eggs of female fish
	the eggs or egg-laden ovary of a fish
	the egg mass or spawn of certain crustaceans such as the lobster
	fish eggs or egg-filled ovary; having a grainy texture