avoidance vs averting

avoidance and averting both are nouns.

Word	Noun	Adjective	Verb	Adverb
avoidance	Yes	No	No	No
averting	Yes	No	No	No

As nouns, averting is a hyponym of avoidance; that is, averting is a word with a more specific, narrower meaning than avoidance:

avoidance: deliberately avoiding; keeping away from or preventing from happening
averting: the act of turning yourself (or your gaze) away

Other hyponyms of avoidance include aversion, escape, near thing.

avoidance (noun)	averting (noun)
deliberately avoiding; keeping away from or preventing from happening	the act of preventing something from occurring
	the act of turning yourself (or your gaze) away