flavorer, flavoring, flavourer, flavouring, seasoning, seasoner - something added to food primarily for the savor it imparts

aspartame - an artificial sweetener made from aspartic acid; used as a calorie-free sweetener

honey - a sweet yellow liquid produced by bees

saccharin - a crystalline substance 500 times sweeter than sugar; used as a calorie-free sweetener

refined sugar, sugar - a white crystalline carbohydrate used as a sweetener and preservative

sirup, syrup - a thick sweet sticky liquid

improvement - the act of improving something; "their improvements increased the value of the property"

seasoning - the act of adding a seasoning to food