drop-down menu vs menu

drop-down menu and menu both are nouns.

Word	Noun	Adjective	Verb	Adverb
drop-down menu	Yes	No	No	No
menu	Yes	No	No	No

As nouns, menu is a hypernym of drop-down menu; that is, menu is a word with a broader meaning than drop-down menu:

drop-down menu: a menu of options that appears below the item when the computer user clicks on it
menu: (computer science) a list of options available to a computer user

Other hypernyms of drop-down menu include computer menu.

drop-down menu (noun)	menu (noun)
a menu of options that appears below the item when the computer user clicks on it	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