refined sugar vs sweetener

refined sugar and sweetener both are nouns.

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

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

refined sugar: a white crystalline carbohydrate used as a sweetener and preservative
sweetener: something added to foods to make them taste sweeter

Other hypernyms of refined sugar include sweetening.

refined sugar (noun)	sweetener (noun)
a white crystalline carbohydrate used as a sweetener and preservative	anything that serves as an enticement
	something added to foods to make them taste sweeter