March equinox vs Noruz

March equinox and Noruz both are nouns.

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

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

March 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 March equinox include Nowrooz, Nowruz.

March 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