seafood vs solid food

seafood and solid food both are nouns.

Word	Noun	Adjective	Verb	Adverb
seafood	Yes	No	No	No
solid food	Yes	No	No	No

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

seafood: edible fish (broadly including freshwater fish) or shellfish or roe etc
solid food: any solid substance (as opposed to liquid) that is used as a source of nourishment

Other hypernyms of seafood include food.

seafood (noun)	solid food (noun)
edible fish (broadly including freshwater fish) or shellfish or roe etc	any solid substance (as opposed to liquid) that is used as a source of nourishment