genus Centaurium vs Centaurium

genus Centaurium and Centaurium both are nouns.

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

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

genus Centaurium and Centaurium: genus of low-growing herbs mostly of Northern Hemisphere having flowers with protruding spirally twisted anthers

genus Centaurium (noun)	Centaurium (noun)
genus of low-growing herbs mostly of Northern Hemisphere having flowers with protruding spirally twisted anthers	genus of low-growing herbs mostly of Northern Hemisphere having flowers with protruding spirally twisted anthers