celestial equator vs equinoctial line

celestial equator and equinoctial line both are nouns.

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

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

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

Other synonyms of celestial equator include equinoctial, equinoctial circle.

celestial equator (noun)	equinoctial line (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