endive vs French endive

endive and French endive both are nouns.

Word	Noun	Adjective	Verb	Adverb
endive	Yes	No	No	No
French endive	Yes	No	No	No

As nouns, French endive is a hyponym of endive; that is, French endive is a word with a more specific, narrower meaning than endive:

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

Other hyponyms of endive include Belgian endive, witloof.

endive (noun)	French endive (noun)
variety of endive having leaves with irregular frilled edges	young broad-leaved endive plant deprived of light to form a narrow whitish head
widely cultivated herb with leaves valued as salad green; either curly serrated leaves or broad flat ones that are usually blanched