Brassica oleracea and Head cabbage plant

Brassica oleracea noun - Wild original of cultivated cabbages; common in western coastal Europe.

Head cabbage plant and Brassica oleracea are semantically related. In some cases you can replace phrase "Head cabbage plant" with "Brassica oleracea", this phrases are similar.

Head cabbage plant noun - Any of various cultivated cabbage plants having a short thick stalk and large compact head of edible usually green leaves.

Brassica oleracea and head cabbage plant are semantically related. You can use "Brassica oleracea" instead a noun phrase "Head cabbage plant".