apoapsis vs celestial point

apoapsis and celestial point both are nouns.

Word	Noun	Adjective	Verb	Adverb
apoapsis	Yes	No	No	No
celestial point	Yes	No	No	No

As nouns, celestial point is a hypernym of apoapsis; that is, celestial point is a word with a broader meaning than apoapsis:

apoapsis: (astronomy) the point in an orbit farthest from the body being orbited
celestial point: a point in the heavens (on the celestial sphere)

apoapsis (noun)	celestial point (noun)
(astronomy) the point in an orbit farthest from the body being orbited	a point in the heavens (on the celestial sphere)