undergo vs have

undergo is not a noun while have is a noun.

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

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

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

undergo (noun)	have (noun)
	a person who possesses great material wealth

undergo (verb)	have (verb)
go through	cause to be born
	suffer from; be ill with
	undergo (as of injuries and illnesses)
	cause to move; cause to be in a certain position or condition
	undergo
	cause to do; cause to act in a specified manner
	serve oneself to, or consume regularly
	have sex with; archaic use
	organize or be responsible for
	go through (mental or physical states or experiences)
	have or possess, either in a concrete or an abstract sense
	achieve a point or goal
	get something; come into possession of
	have ownership or possession of
	receive willingly something given or offered
	have a personal or business relationship with someone
	have as a feature
	be confronted with