clean up vs tidy

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

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

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

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

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

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

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