averment vs aver

averment is a noun but aver is not a noun.

Word	Noun	Adjective	Verb	Adverb
averment	Yes	No	No	No
aver	No	No	Yes	No

averment (noun)	aver (noun)
a declaration that is made emphatically (as if no supporting evidence were necessary)

averment (verb)	aver (verb)
	to declare or affirm solemnly and formally as true
	report or maintain