accompanying vs concomitant

accompanying is not a noun while concomitant is a noun.

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

As adjectives, accompanying and concomitant are synonyms defined as:

accompanying and concomitant: occurring with or following as a consequence

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

accompanying (noun)	concomitant (noun)
	an event or situation that happens at the same time as or in connection with another

accompanying (adjective)	concomitant (adjective)
occurring with or following as a consequence	occurring with or following as a consequence