matrimonial vs matrimony

matrimonial is not a noun while matrimony is a noun.

Word	Noun	Adjective	Verb	Adverb
matrimonial	No	Yes	No	No
matrimony	Yes	No	No	No

matrimonial (noun)	matrimony (noun)
	the ceremony or sacrament of marriage
	the state of being a married couple voluntarily joined for life (or until divorce)

matrimonial (adjective)	matrimony (adjective)
of or relating to the state of marriage