cover up vs hide

cover up is not a noun while hide is a noun.

Word	Noun	Adjective	Verb	Adverb
cover up	No	No	Yes	No
hide	Yes	No	Yes	No

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

Other hypernyms of cover up include conceal.

cover up (noun)	hide (noun)
	body covering of a living animal
	the dressed skin of an animal (especially a large animal)

cover up (verb)	hide (verb)
hide from view or knowledge	make undecipherable or imperceptible by obscuring or concealing
	cover as if with a shroud
	prevent from being seen or discovered
	be or go into hiding; keep out of sight, as for protection and safety