hide vs cover up

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

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

As verbs, cover up is a hyponym of hide; that is, cover up is a word with a more specific, narrower meaning than hide:

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

hide (verb)	cover up (verb)
make undecipherable or imperceptible by obscuring or concealing	hide from view or knowledge
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