bigamy vs matrimony

bigamy and matrimony both are nouns.

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

As nouns, matrimony is a hypernym of bigamy; that is, matrimony is a word with a broader meaning than bigamy:

bigamy: the state of having two spouses at the same time
matrimony: the state of being a married couple voluntarily joined for life (or until divorce)

Other hypernyms of bigamy include marriage, spousal relationship, union, wedlock.

bigamy (noun)	matrimony (noun)
the offense of marrying someone while you have a living spouse from whom no valid divorce has occurred	the ceremony or sacrament of marriage
the state of having two spouses at the same time	the state of being a married couple voluntarily joined for life (or until divorce)