monandry vs wedlock

monandry and wedlock both are nouns.

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

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

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

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

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