genus Brassica vs Brassica

genus Brassica and Brassica both are nouns.

Word	Noun	Adjective	Verb	Adverb
genus Brassica	Yes	No	No	No
Brassica	Yes	No	No	No

As nouns, genus Brassica and Brassica are synonyms defined as:

genus Brassica and Brassica: mustards: cabbages, cauliflowers, turnips, etc.

genus Brassica (noun)	Brassica (noun)
mustards: cabbages, cauliflowers, turnips, etc.	mustards: cabbages, cauliflowers, turnips, etc.