respiration vs respire

respiration is a noun but respire is not a noun.

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

respiration (noun)	respire (noun)
the metabolic processes whereby certain organisms obtain energy from organic molecules; processes that take place in the cells and tissues during which energy is released and carbon dioxide is produced and absorbed by the blood to be transported to the lungs
the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation
a single complete act of breathing in and out

respiration (verb)	respire (verb)
	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