cockle-bur vs weed

cockle-bur and weed both are nouns.

Word	Noun	Adjective	Verb	Adverb
cockle-bur	Yes	No	No	No
weed	Yes	No	Yes	No

As nouns, weed is a hypernym of cockle-bur; that is, weed is a word with a broader meaning than cockle-bur:

cockle-bur (noun)	weed (noun)
any coarse weed of the genus Xanthium having spiny burrs	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

cockle-bur (verb)	weed (verb)
	clear of weeds