spinach beet vs beet

spinach beet and beet both are nouns.

Word	Noun	Adjective	Verb	Adverb
spinach beet	Yes	No	No	No
beet	Yes	No	No	No

As nouns, beet is a hypernym of spinach beet; that is, beet is a word with a broader meaning than spinach beet:

spinach beet: beet lacking swollen root; grown as a vegetable for its edible leaves and stalks
beet: biennial Eurasian plant usually having a swollen edible root; widely cultivated as a food crop

Other hypernyms of spinach beet include Beta vulgaris, common beet.

spinach beet (noun)	beet (noun)
long succulent whitish stalks with large green leaves	round red root vegetable
beet lacking swollen root; grown as a vegetable for its edible leaves and stalks	biennial Eurasian plant usually having a swollen edible root; widely cultivated as a food crop