spinach mustard vs Brassica perviridis

spinach mustard and Brassica perviridis both are nouns.

Word	Noun	Adjective	Verb	Adverb
spinach mustard	Yes	No	No	No
Brassica perviridis	Yes	No	No	No

As nouns, spinach mustard and Brassica perviridis are synonyms defined as:

spinach mustard and Brassica perviridis: Asiatic plant cultivated for its swollen root crown and edible foliage

Other synonyms of spinach mustard include Brassica rapa perviridis, tendergreen.

spinach mustard (noun)	Brassica perviridis (noun)
Asiatic plant cultivated for its swollen root crown and edible foliage	Asiatic plant cultivated for its swollen root crown and edible foliage