matrimony vs marriage

matrimony and marriage both are nouns.

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

As nouns, matrimony and marriage are synonyms defined as:

matrimony and marriage: the state of being a married couple voluntarily joined for life (or until divorce)

Other synonyms of matrimony include spousal relationship, union, wedlock.

matrimony (noun)	marriage (noun)
the ceremony or sacrament of marriage	the act of marrying; the nuptial ceremony
the state of being a married couple voluntarily joined for life (or until divorce)	two people who are married to each other
	the state of being a married couple voluntarily joined for life (or until divorce)
	a close and intimate union