corn sugar vs refined sugar

corn sugar and refined sugar both are nouns.

Word	Noun	Adjective	Verb	Adverb
corn sugar	Yes	No	No	No
refined sugar	Yes	No	No	No

As nouns, refined sugar is a hypernym of corn sugar; that is, refined sugar is a word with a broader meaning than corn sugar:

corn sugar: dextrose used as sweetening agent
refined sugar: a white crystalline carbohydrate used as a sweetener and preservative

Other hypernyms of corn sugar include sugar.

corn sugar (noun)	refined sugar (noun)
dextrose used as sweetening agent	a white crystalline carbohydrate used as a sweetener and preservative
dextrose made by hydrolysis of cornstarch