matelote vs fish stew

matelote and fish stew both are nouns.

Word	Noun	Adjective	Verb	Adverb
matelote	Yes	No	No	No
fish stew	Yes	No	No	No

As nouns, fish stew is a hypernym of matelote; that is, fish stew is a word with a broader meaning than matelote:

matelote: highly seasoned soup or stew made of freshwater fishes (eel, carp, perch) with wine and stock
fish stew: a stew made with fish

matelote (noun)	fish stew (noun)
highly seasoned soup or stew made of freshwater fishes (eel, carp, perch) with wine and stock	a stew made with fish