bear on vs impact

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

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

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

Other synonyms of bear on include affect, bear upon, touch, touch on.

bear on (noun)	impact (noun)
	influencing strongly
	the violent interaction of individuals or groups entering into combat
	the striking of one body against another
	a forceful consequence; a strong effect

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