calamari vs seafood

calamari and seafood both are nouns.

Word	Noun	Adjective	Verb	Adverb
calamari	Yes	No	No	No
seafood	Yes	No	No	No

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

calamari: (Italian cuisine) squid prepared as food
seafood: edible fish (broadly including freshwater fish) or shellfish or roe etc

calamari (noun)	seafood (noun)
(Italian cuisine) squid prepared as food	edible fish (broadly including freshwater fish) or shellfish or roe etc