apoapsis vs apogee

apoapsis and apogee both are nouns.

Word	Noun	Adjective	Verb	Adverb
apoapsis	Yes	No	No	No
apogee	Yes	No	No	No

As nouns, apogee is a hyponym of apoapsis; that is, apogee is a word with a more specific, narrower meaning than apoapsis:

apoapsis: (astronomy) the point in an orbit farthest from the body being orbited
apogee: apoapsis in Earth orbit; the point in its orbit where a satellite is at the greatest distance from the Earth

Other hyponyms of apoapsis include aphelion, apojove, apolune, aposelene.

apoapsis (noun)	apogee (noun)
(astronomy) the point in an orbit farthest from the body being orbited	apoapsis in Earth orbit; the point in its orbit where a satellite is at the greatest distance from the Earth
	a final climactic stage