cockle-burr vs cocklebur

cockle-burr and cocklebur both are nouns.

Word	Noun	Adjective	Verb	Adverb
cockle-burr	Yes	No	No	No
cocklebur	Yes	No	No	No

As nouns, cockle-burr and cocklebur are synonyms defined as:

cockle-burr and cocklebur: any coarse weed of the genus Xanthium having spiny burrs

Other synonyms of cockle-burr include cockle-bur, cockleburr.

cockle-burr (noun)	cocklebur (noun)
any coarse weed of the genus Xanthium having spiny burrs	any coarse weed of the genus Xanthium having spiny burrs
	burdock having heart-shaped leaves found in open woodland, hedgerows and rough grassland of Europe (except extreme N) and Asia Minor; sometimes cultivated for medicinal and culinary use