Belgian endive vs escarole

Belgian endive and escarole both are nouns.

Word	Noun	Adjective	Verb	Adverb
Belgian endive	Yes	No	No	No
escarole	Yes	No	No	No

As nouns, escarole is a hypernym of Belgian endive; that is, escarole is a word with a broader meaning than Belgian endive:

Belgian endive: young broad-leaved endive plant deprived of light to form a narrow whitish head
escarole: variety of endive having leaves with irregular frilled edges

Other hypernyms of Belgian endive include chicory escarole, endive.

Belgian endive (noun)	escarole (noun)
young broad-leaved endive plant deprived of light to form a narrow whitish head	variety of endive having leaves with irregular frilled edges