concern vs bear on

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

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

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

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

concern (noun)	bear on (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

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