accompanying vs incidental

accompanying is not a noun while incidental is a noun.

Word	Noun	Adjective	Verb	Adverb
accompanying	No	Yes	No	No
incidental	Yes	Yes	No	No

As adjectives, accompanying and incidental are synonyms defined as:

accompanying and incidental: occurring with or following as a consequence

Other synonyms of accompanying include attendant, collateral, concomitant, consequent, ensuant, resultant, sequent.

accompanying (noun)	incidental (noun)
	an item that is incidental
	(frequently plural) an expense not budgeted or not specified

accompanying (adjective)	incidental (adjective)
occurring with or following as a consequence	(sometimes followed by `to') minor or casual or subordinate in significance or nature or occurring as a chance concomitant or consequence
	not of prime or central importance
	occurring with or following as a consequence