orach vs garden orache

orach and garden orache both are nouns.

Word	Noun	Adjective	Verb	Adverb
orach	Yes	No	No	No
garden orache	Yes	No	No	No

As nouns, garden orache is a hyponym of orach; that is, garden orache is a word with a more specific, narrower meaning than orach:

orach: any of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshes
garden orache: Asiatic plant resembling spinach often used as a potherb; naturalized in Europe and North America

Other hyponyms of orach include Atriplex hortensis, mountain spinach.

orach (noun)	garden orache (noun)
any of various herbaceous plants of the genus Atriplex that thrive in deserts and salt marshes	Asiatic plant resembling spinach often used as a potherb; naturalized in Europe and North America