saccharin vs sweetener

saccharin and sweetener both are nouns.

Word	Noun	Adjective	Verb	Adverb
saccharin	Yes	No	No	No
sweetener	Yes	No	No	No

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

saccharin: a crystalline substance 500 times sweeter than sugar; used as a calorie-free sweetener
sweetener: something added to foods to make them taste sweeter

Other hypernyms of saccharin include sweetening.

saccharin (noun)	sweetener (noun)
a crystalline substance 500 times sweeter than sugar; used as a calorie-free sweetener	anything that serves as an enticement
	something added to foods to make them taste sweeter