hole up vs rack up

hole up and rack up both are verbs.

Word	Noun	Adjective	Verb	Adverb
hole up	No	No	Yes	No
rack up	No	No	Yes	No

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

Other hypernyms of hole up include score, tally.

hole up (verb)	rack up (verb)
sleep during winter	supply a rack with feed for (horses or other animals)
score a hole in one	defeat thoroughly
remain secluded or in hiding	gain points in a game
	place in a rack