shack up vs dwell

shack up and dwell both are verbs.

Word	Noun	Adjective	Verb	Adverb
shack up	No	No	Yes	No
dwell	No	No	Yes	No

As verbs, dwell is a hypernym of shack up; that is, dwell is a word with a broader meaning than shack up:

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

Other hypernyms of shack up include inhabit, live, populate.

shack up (verb)	dwell (verb)
share living quarters; usually said of people who are not married and live together as a couple	think moodily or anxiously about something
	come back to
	be an inhabitant of or reside in
	originate (in)
	exist or be situated within