spinach beet vs common beet

spinach beet and common beet both are nouns.

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

As nouns, common beet is a hypernym of spinach beet; that is, common 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
common beet: biennial Eurasian plant usually having a swollen edible root; widely cultivated as a food crop

Other hypernyms of spinach beet include beet, Beta vulgaris.

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