equinoctial line vs celestial equator

equinoctial line and celestial equator both are nouns.

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

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

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

Other synonyms of equinoctial line include equinoctial, equinoctial circle.

equinoctial line (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