broccoli vs Brassica oleracea italica

broccoli and Brassica oleracea italica both are nouns.

Word	Noun	Adjective	Verb	Adverb
broccoli	Yes	No	No	No
Brassica oleracea italica	Yes	No	No	No

As nouns, broccoli and Brassica oleracea italica are synonyms defined as:

broccoli and Brassica oleracea italica: plant with dense clusters of tight green flower buds

broccoli (noun)	Brassica oleracea italica (noun)
branched green undeveloped flower heads	plant with dense clusters of tight green flower buds
plant with dense clusters of tight green flower buds