prix fixe vs menu

prix fixe and menu both are nouns.

Word	Noun	Adjective	Verb	Adverb
prix fixe	Yes	Yes	No	No
menu	Yes	No	No	No

As nouns, menu is a hypernym of prix fixe; that is, menu is a word with a broader meaning than prix fixe:

Other hypernyms of prix fixe include bill of fare, card, carte, carte du jour.

prix fixe (noun)	menu (noun)
a menu listing fixed meals at fixed prices	an agenda of things to do
	a list of dishes available at a restaurant
	(computer science) a list of options available to a computer user
	the dishes making up a meal

prix fixe (adjective)	menu (adjective)
(of a restaurant meal) complete but with limited choices and at a fixed price