undergo vs respire

undergo and respire both are verbs.

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

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

undergo: go through
respire: undergo the biomedical and metabolic processes of respiration by taking up oxygen and producing carbon monoxide

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

undergo (verb)	respire (verb)
go through	draw air into, and expel out of, the lungs
	undergo the biomedical and metabolic processes of respiration by taking up oxygen and producing carbon monoxide
	breathe easily again, as after exertion or anxiety