yawn vs respire

yawn is a noun but respire is not a noun.

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

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

Other hypernyms of yawn include breathe, suspire, take a breath.

yawn (noun)	respire (noun)
an involuntary intake of breath through a wide open mouth; usually triggered by fatigue or boredom

yawn (verb)	respire (verb)
utter a yawn, as from lack of oxygen or when one is tired	draw air into, and expel out of, the lungs
be wide open	undergo the biomedical and metabolic processes of respiration by taking up oxygen and producing carbon monoxide
	breathe easily again, as after exertion or anxiety