wedlock vs spousal relationship

wedlock and spousal relationship both are nouns.

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

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

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

Other synonyms of wedlock include marriage, matrimony, union.

wedlock (noun)	spousal relationship (noun)
the state of being a married couple voluntarily joined for life (or until divorce)	the state of being a married couple voluntarily joined for life (or until divorce)