artificial additive vs food additive

artificial additive and food additive both are nouns.

Word	Noun	Adjective	Verb	Adverb
artificial additive	Yes	No	No	No
food additive	Yes	No	No	No

As nouns, artificial additive and food additive are synonyms defined as:

artificial additive and food additive: an additive to food intended to improve its flavor or appearance or shelf-life

artificial additive (noun)	food additive (noun)
an additive to food intended to improve its flavor or appearance or shelf-life	an additive to food intended to improve its flavor or appearance or shelf-life