bear on vs concern

bear on is not a noun while concern is a noun.

Word	Noun	Adjective	Verb	Adverb
bear on	No	No	Yes	No
concern	Yes	No	Yes	No

As verbs, bear on and concern are synonyms defined as:

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

bear on (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

bear on (verb)	concern (verb)
have an effect upon	be relevant to
press, drive, or impel (someone) to action or completion of an action	be on the mind of
be relevant to
keep or maintain in unaltered condition; cause to remain or last