perilune vs point of periapsis

perilune and point of periapsis both are nouns.

Word	Noun	Adjective	Verb	Adverb
perilune	Yes	No	No	No
point of periapsis	Yes	No	No	No

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

perilune: periapsis in orbit around the moon
point of periapsis: (astronomy) the point in an orbit closest to the body being orbited

Other hypernyms of perilune include periapsis.

perilune (noun)	point of periapsis (noun)
periapsis in orbit around the moon	(astronomy) the point in an orbit closest to the body being orbited