impacted tooth vs impaction

impacted tooth and impaction both are nouns.

Word	Noun	Adjective	Verb	Adverb
impacted tooth	Yes	No	No	No
impaction	Yes	No	No	No

As nouns, impacted tooth and impaction are synonyms defined as:

impacted tooth and impaction: a disorder in which a tooth is so crowded in its socket that it cannot erupt normally

impacted tooth (noun)	impaction (noun)
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 a tooth is so crowded in its socket that it cannot erupt normally
	a disorder in which feces are impacted in the lower colon
	the condition of being pressed closely together and firmly fixed