cosmic time vs equinox

cosmic time and equinox both are nouns.

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

As nouns, equinox is a hyponym of cosmic time; that is, equinox is a word with a more specific, narrower meaning than cosmic time:

cosmic time: the time covered by the physical formation and development of the universe
equinox: either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length

Other hyponyms of cosmic time include sidereal time, solstice.

cosmic time (noun)	equinox (noun)
the time covered by the physical formation and development of the universe	(astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
	either of two times of the year when the sun crosses the plane of the earth's equator and day and night are of equal length