sweetening vs seasoner

sweetening and seasoner both are nouns.

Word	Noun	Adjective	Verb	Adverb
sweetening	Yes	No	No	No
seasoner	Yes	No	No	No

As nouns, seasoner is a hypernym of sweetening; that is, seasoner is a word with a broader meaning than sweetening:

Other hypernyms of sweetening include flavorer, flavoring, flavourer, flavouring, seasoning.

sweetening (noun)	seasoner (noun)
the act of adding a sweetener to food	something added to food primarily for the savor it imparts
an improvement that makes something more agreeable	a cook who uses seasonings
something added to foods to make them taste sweeter