respire vs undergo

respire and undergo both are verbs.

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

As verbs, undergo is a hypernym of respire; that is, undergo is a word with a broader meaning than respire:

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

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