exogamy vs spousal relationship

exogamy and spousal relationship both are nouns.

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

As nouns, spousal relationship is a hypernym of exogamy; that is, spousal relationship is a word with a broader meaning than exogamy:

exogamy: marriage to a person belonging to a tribe or group other than your own as required by custom or law
spousal relationship: the state of being a married couple voluntarily joined for life (or until divorce)

Other hypernyms of exogamy include marriage, matrimony, union, wedlock.

exogamy (noun)	spousal relationship (noun)
marriage to a person belonging to a tribe or group other than your own as required by custom or law	the state of being a married couple voluntarily joined for life (or until divorce)