genus Rumex vs Rumex

genus Rumex and Rumex both are nouns.

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

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

genus Rumex and Rumex: docks: coarse herbs and shrubs mainly native to north temperate regions

genus Rumex (noun)	Rumex (noun)
docks: coarse herbs and shrubs mainly native to north temperate regions	docks: coarse herbs and shrubs mainly native to north temperate regions