disrobe vs undress

disrobe is not a noun while undress is a noun.

Word	Noun	Adjective	Verb	Adverb
disrobe	No	No	Yes	No
undress	Yes	No	Yes	No

As verbs, disrobe and undress are synonyms defined as:

Other synonyms of disrobe include discase, peel, strip, strip down, uncase, unclothe.

disrobe (noun)	undress (noun)
	partial or complete nakedness

disrobe (verb)	undress (verb)
get undressed	get undressed
	remove (someone's or one's own) clothes