avouchment vs averment

avouchment and averment both are nouns.

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

As nouns, averment is a hypernym of avouchment; that is, averment is a word with a broader meaning than avouchment:

avouchment: a statement asserting the existence or the truth of something
averment: a declaration that is made emphatically (as if no supporting evidence were necessary)

Other hypernyms of avouchment include assertion, asseveration.

avouchment (noun)	averment (noun)
a statement asserting the existence or the truth of something	a declaration that is made emphatically (as if no supporting evidence were necessary)