undergo vs experience

undergo is not a noun while experience is a noun.

Word	Noun	Adjective	Verb	Adverb
undergo	No	No	Yes	No
experience	Yes	No	Yes	No

As verbs, experience is a hyponym of undergo; that is, experience is a word with a more specific, narrower meaning than undergo:

Other hyponyms of undergo include respire, labor, labour, submit, take, get, have, receive, go through, see.

undergo (noun)	experience (noun)
	the content of direct observation or participation in an event
	the accumulation of knowledge or skill that results from direct participation in events or activities
	an event as apprehended

undergo (verb)	experience (verb)
go through	undergo
	have firsthand knowledge of states, situations, emotions, or sensations
	undergo an emotional sensation or be in a particular state of mind
	go through (mental or physical states or experiences)
	undergo or live through a difficult experience