live together vs populate

live together and populate both are verbs.

Word	Noun	Adjective	Verb	Adverb
live together	No	No	Yes	No
populate	No	No	Yes	No

As verbs, populate is a hypernym of live together; that is, populate is a word with a broader meaning than live together:

live together: share living quarters; usually said of people who are not married and live together as a couple
populate: be an inhabitant of or reside in

Other hypernyms of live together include dwell, inhabit, live.

live together (verb)	populate (verb)
share living quarters; usually said of people who are not married and live together as a couple	fill with inhabitants
	be an inhabitant of or reside in