spawn vs roe

spawn and roe both are nouns.

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

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

spawn (noun)	roe (noun)
the mass of eggs deposited by fish or amphibians or molluscs	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

spawn (verb)	roe (verb)
lay spawn
call forth