bear upon vs impact

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

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

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

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

bear upon (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 upon (verb)	impact (verb)
have an effect upon	have an effect upon
	press or wedge together; pack together