Cocklebur and Clotbur

Cocklebur noun - 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.

Clotbur and cocklebur are semantically related. In some cases you can use "Clotbur" instead a noun "Cocklebur".

Clotbur noun - Any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs.

Cocklebur and clotbur are semantically related. Sometimes you can replace term "Cocklebur" with "Clotbur", this nouns are similar.