beetroot vs Beta vulgaris rubra

beetroot and Beta vulgaris rubra both are nouns.

Word	Noun	Adjective	Verb	Adverb
beetroot	Yes	No	No	No
Beta vulgaris rubra	Yes	No	No	No

As nouns, beetroot and Beta vulgaris rubra are synonyms defined as:

beetroot and Beta vulgaris rubra: beet having a massively swollen red root; widely grown for human consumption

beetroot (noun)	Beta vulgaris rubra (noun)
round red root vegetable	beet having a massively swollen red root; widely grown for human consumption
beet having a massively swollen red root; widely grown for human consumption