hang-up vs preoccupation

hang-up and preoccupation both are nouns.

Word	Noun	Adjective	Verb	Adverb
hang-up	Yes	No	No	No
preoccupation	Yes	No	No	No

As nouns, preoccupation is a hypernym of hang-up; that is, preoccupation is a word with a broader meaning than hang-up:

hang-up (noun)	preoccupation (noun)
an unforeseen obstacle	the act of taking occupancy before someone else does
an emotional preoccupation	the mental state of being preoccupied by something
	an idea that preoccupies the mind and holds the attention