centaury vs suffrutex

centaury and suffrutex both are nouns.

Word	Noun	Adjective	Verb	Adverb
centaury	Yes	No	No	No
suffrutex	Yes	No	No	No

As nouns, suffrutex is a hypernym of centaury; that is, suffrutex is a word with a broader meaning than centaury:

Other hypernyms of centaury include subshrub.

centaury (noun)	suffrutex (noun)
any plant of the genus Centaurea	low-growing woody shrub or perennial with woody base
any of various plants of the genus Centaurium