come-on vs sweetener

come-on and sweetener both are nouns.

Word	Noun	Adjective	Verb	Adverb
come-on	Yes	No	No	No
sweetener	Yes	No	No	No

As nouns, come-on and sweetener are synonyms defined as:

Other synonyms of come-on include bait, hook, lure.

come-on (noun)	sweetener (noun)
qualities that attract by seeming to promise some kind of reward	anything that serves as an enticement
anything that serves as an enticement	something added to foods to make them taste sweeter