monogamy vs wedlock

monogamy and wedlock both are nouns.

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

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

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

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

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