impact vs impaction

impact and impaction both are nouns.

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

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

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