spousal relationship vs matrimony

spousal relationship and matrimony both are nouns.

Word	Noun	Adjective	Verb	Adverb
spousal relationship	Yes	No	No	No
matrimony	Yes	No	No	No

As nouns, spousal relationship and matrimony are synonyms defined as:

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

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

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