par vs rack up

par is a noun but rack up is not a noun.

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

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

Other hypernyms of par include score, tally.

par (noun)	rack up (noun)
(golf) the standard number of strokes set for each hole on a golf course, or for the entire course
a state of being essentially equal or equivalent; equally balanced

par (verb)	rack up (verb)
make a score (on a hole) equal to par	supply a rack with feed for (horses or other animals)
	defeat thoroughly
	gain points in a game
	place in a rack