extenuate vs extenuation

extenuate is not a noun while extenuation is a noun.

Word	Noun	Adjective	Verb	Adverb
extenuate	No	No	Yes	No
extenuation	Yes	No	No	No

extenuate (noun)	extenuation (noun)
	to act in such a way as to cause an offense to seem less serious
	a partial excuse to mitigate censure; an attempt to represent an offense as less serious than it appears by showing mitigating circumstances

extenuate (verb)	extenuation (verb)
lessen or to try to lessen the seriousness or extent of