pertain vs concern

pertain is not a noun while concern is a noun.

Word	Noun	Adjective	Verb	Adverb
pertain	No	No	Yes	No
concern	Yes	No	Yes	No

As verbs, pertain and concern are synonyms defined as:

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

pertain (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

pertain (verb)	concern (verb)
be a part or attribute of	be relevant to
be relevant to	be on the mind of