soft roe vs seafood

soft roe and seafood both are nouns.

Word	Noun	Adjective	Verb	Adverb
soft roe	Yes	No	No	No
seafood	Yes	No	No	No

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

soft roe: fish sperm or sperm-filled reproductive gland; having a creamy texture
seafood: edible fish (broadly including freshwater fish) or shellfish or roe etc

soft roe (noun)	seafood (noun)
fish sperm or sperm-filled reproductive gland; having a creamy texture	edible fish (broadly including freshwater fish) or shellfish or roe etc