impaction vs impact

impaction and impact both are nouns.

Word	Noun	Adjective	Verb	Adverb
impaction	Yes	No	No	No
impact	Yes	No	Yes	No

impaction (noun)	impact (noun)
a sharp collision produced by striking or dashing against something	influencing strongly
a disorder in which a tooth is so crowded in its socket that it cannot erupt normally	the violent interaction of individuals or groups entering into combat
a disorder in which feces are impacted in the lower colon	the striking of one body against another
the condition of being pressed closely together and firmly fixed	a forceful consequence; a strong effect

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