clotbur vs subshrub

clotbur and subshrub both are nouns.

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

As nouns, subshrub is a hypernym of clotbur; that is, subshrub 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
subshrub: low-growing woody shrub or perennial with woody base

Other hypernyms of clotbur include suffrutex.

clotbur (noun)	subshrub (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