savoy cabbage vs head cabbage

savoy cabbage and head cabbage both are nouns.

Word	Noun	Adjective	Verb	Adverb
savoy cabbage	Yes	No	No	No
head cabbage	Yes	No	No	No

As nouns, head cabbage is a hypernym of savoy cabbage; that is, head cabbage is a word with a broader meaning than savoy cabbage:

savoy cabbage: head of soft crinkly leaves
head cabbage: any of several varieties of cabbage having a large compact globular head; may be steamed or boiled or stir-fried or used raw in coleslaw

As nouns, head cabbage is a hypernym of savoy cabbage; that is, head cabbage is a word with a broader meaning than savoy cabbage:

savoy cabbage: cabbage plant with a compact head of crinkled leaves
head cabbage: any of various cultivated cabbage plants having a short thick stalk and large compact head of edible usually green leaves

Other hypernyms of savoy cabbage include Brassica oleracea capitata, head cabbage plant.

savoy cabbage (noun)	head cabbage (noun)
head of soft crinkly leaves	any of several varieties of cabbage having a large compact globular head; may be steamed or boiled or stir-fried or used raw in coleslaw
cabbage plant with a compact head of crinkled leaves	any of various cultivated cabbage plants having a short thick stalk and large compact head of edible usually green leaves