Centaurea solstitialis vs weed

Centaurea solstitialis and weed both are nouns.

Word	Noun	Adjective	Verb	Adverb
Centaurea solstitialis	Yes	No	No	No
weed	Yes	No	Yes	No

As nouns, weed is a hypernym of Centaurea solstitialis; that is, weed is a word with a broader meaning than Centaurea solstitialis:

Centaurea solstitialis: European weed having a winged stem and hairy leaves; adventive in the eastern United States
weed: any plant that crowds out cultivated plants

Centaurea solstitialis (noun)	weed (noun)
European weed having a winged stem and hairy leaves; adventive in the eastern United States	street names for marijuana
	a black band worn by a man (on the arm or hat) as a sign of mourning
	any plant that crowds out cultivated plants

Centaurea solstitialis (verb)	weed (verb)
	clear of weeds