Centaurea vs bluebottle

Centaurea and bluebottle both are nouns.

Word	Noun	Adjective	Verb	Adverb
Centaurea	Yes	No	No	No
bluebottle	Yes	No	No	No

Centaurea (noun)	bluebottle (noun)
knapweed; star thistle	blowfly with iridescent blue body; makes a loud buzzing noise in flight
	an annual Eurasian plant cultivated in North America having showy heads of blue or purple or pink or white flowers