cheddar vs store cheese

cheddar and store cheese both are nouns.

Word	Noun	Adjective	Verb	Adverb
cheddar	Yes	No	No	No
store cheese	Yes	No	No	No

As nouns, store cheese is a hyponym of cheddar; that is, store cheese is a word with a more specific, narrower meaning than cheddar:

cheddar: hard smooth-textured cheese; originally made in Cheddar in southwestern England
store cheese: informal names for American cheddar

Other hyponyms of cheddar include rat cheese.

cheddar (noun)	store cheese (noun)
hard smooth-textured cheese; originally made in Cheddar in southwestern England	informal names for American cheddar