respire vs expire

respire and expire both are verbs.

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

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

respire (verb)	expire (verb)
draw air into, and expel out of, the lungs	expel air
undergo the biomedical and metabolic processes of respiration by taking up oxygen and producing carbon monoxide	pass from physical life and lose all bodily attributes and functions necessary to sustain life
breathe easily again, as after exertion or anxiety	lose validity