cascading menu vs hierarchical menu

cascading menu and hierarchical menu both are nouns.

Word	Noun	Adjective	Verb	Adverb
cascading menu	Yes	No	No	No
hierarchical menu	Yes	No	No	No

As nouns, cascading menu and hierarchical menu are synonyms defined as:

cascading menu and hierarchical menu: a secondary menu that appears while you are holding the cursor over an item on the primary menu

Other synonyms of cascading menu include submenu.

cascading menu (noun)	hierarchical menu (noun)
a secondary menu that appears while you are holding the cursor over an item on the primary menu	a secondary menu that appears while you are holding the cursor over an item on the primary menu