spring equinox vs Noruz

spring equinox and Noruz both are nouns.

Word	Noun	Adjective	Verb	Adverb
spring equinox	Yes	No	No	No
Noruz	Yes	No	No	No

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

spring equinox: March 21
Noruz: (Persian) the new year holiday in Iran and Azerbaijan and Afghanistan and Pakistan and parts of India and among the Kurds; comes at the vernal equinox

Other hyponyms of spring equinox include Nowrooz, Nowruz.

spring equinox (noun)	Noruz (noun)
March 21	(Persian) the new year holiday in Iran and Azerbaijan and Afghanistan and Pakistan and parts of India and among the Kurds; comes at the vernal equinox