bust up vs wrack

bust up is not a noun while wrack is a noun.

Word	Noun	Adjective	Verb	Adverb
bust up	No	No	Yes	No
wrack	Yes	No	Yes	No

As verbs, bust up and wrack are synonyms defined as:

Other synonyms of bust up include wreck.

bust up (noun)	wrack (noun)
	dried seaweed especially that cast ashore
	growth of marine vegetation especially of the large forms such as rockweeds and kelp
	the destruction or collapse of something

bust up (verb)	wrack (verb)
smash or break forcefully	smash or break forcefully