solstice vs cosmic time

solstice and cosmic time both are nouns.

Word	Noun	Adjective	Verb	Adverb
solstice	Yes	No	No	No
cosmic time	Yes	No	No	No

As nouns, cosmic time is a hypernym of solstice; that is, cosmic time is a word with a broader meaning than solstice:

solstice: either of the two times of the year when the sun is at its greatest distance from the celestial equator
cosmic time: the time covered by the physical formation and development of the universe

solstice (noun)	cosmic time (noun)
either of the two times of the year when the sun is at its greatest distance from the celestial equator	the time covered by the physical formation and development of the universe