monandry vs marriage

monandry and marriage both are nouns.

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

As nouns, marriage is a hypernym of monandry; that is, marriage is a word with a broader meaning than monandry:

monandry: the state of having only one husband at a time
marriage: the state of being a married couple voluntarily joined for life (or until divorce)

Other hypernyms of monandry include matrimony, spousal relationship, union, wedlock.

monandry (noun)	marriage (noun)
the state of having only one husband at a time	the act of marrying; the nuptial ceremony
	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