tidy vs clean up

tidy is a noun but clean up is not a noun.

Word	Noun	Adjective	Verb	Adverb
tidy	Yes	Yes	Yes	No
clean up	No	No	Yes	No

As verbs, tidy and clean up are synonyms defined as:

Other synonyms of tidy include neaten, square away, straighten, straighten out, tidy up.

tidy (noun)	clean up (noun)
receptacle that holds odds and ends (as sewing materials)

tidy (adjective)	clean up (adjective)
marked by order and cleanliness in appearance or habits
large in amount or extent or degree
(of hair) neat and tidy

tidy (verb)	clean up (verb)
put (things or places) in order	make oneself clean, presentable or neat
	put (things or places) in order
	finish attending to
	make a big profit; often in a short period of time