Rumex vs genus Rumex

Rumex and genus Rumex both are nouns.

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

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

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

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