clotbur vs suffrutex

clotbur and suffrutex both are nouns.

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

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

clotbur: any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs
suffrutex: low-growing woody shrub or perennial with woody base

Other hypernyms of clotbur include subshrub.

clotbur (noun)	suffrutex (noun)
any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs	low-growing woody shrub or perennial with woody base