impaction vs impingement

impaction and impingement both are nouns.

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

As nouns, impaction and impingement are synonyms defined as:

impaction and impingement: a sharp collision produced by striking or dashing against something

impaction (noun)	impingement (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	a sharp collision produced by striking or dashing against something
a disorder in which feces are impacted in the lower colon
the condition of being pressed closely together and firmly fixed