equinoctial vs celestial equator

equinoctial and celestial equator both are nouns.

Word	Noun	Adjective	Verb	Adverb
equinoctial	Yes	Yes	No	No
celestial equator	Yes	No	No	No

As nouns, equinoctial and celestial equator are synonyms defined as:

equinoctial and celestial equator: the great circle on the celestial sphere midway between the celestial poles

Other synonyms of equinoctial include equinoctial circle, equinoctial line.

equinoctial (noun)	celestial equator (noun)
the great circle on the celestial sphere midway between the celestial poles	the great circle on the celestial sphere midway between the celestial poles

equinoctial (adjective)	celestial equator (adjective)
relating to an equinox (when the lengths of night and day are equal)
relating to the vicinity of the equator