have to do with vs concern

have to do with is not a noun while concern is a noun.

Word	Noun	Adjective	Verb	Adverb
have to do with	No	No	Yes	No
concern	Yes	No	Yes	No

As verbs, have to do with and concern are synonyms defined as:

Other synonyms of have to do with include bear on, come to, pertain, refer, relate, touch, touch on.

have to do with (noun)	concern (noun)
	something that interests you because it is important or affects you
	something or someone that causes anxiety; a source of unhappiness
	a feeling of sympathy for someone or something
	an anxious feeling
	a commercial or industrial enterprise and the people who constitute it

have to do with (verb)	concern (verb)
be relevant to	be relevant to
	be on the mind of