apoapsis vs point of apoapsis

apoapsis and point of apoapsis both are nouns.

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

As nouns, apoapsis and point of apoapsis are synonyms defined as:

apoapsis and point of apoapsis: (astronomy) the point in an orbit farthest from the body being orbited

apoapsis (noun)	point of apoapsis (noun)
(astronomy) the point in an orbit farthest from the body being orbited	(astronomy) the point in an orbit farthest from the body being orbited