clotbur vs burdock

clotbur and burdock both are nouns.

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

As nouns, clotbur and burdock are synonyms defined as:

clotbur and burdock: any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs

clotbur (noun)	burdock (noun)
any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs	any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs