frappe vs milkshake

frappe and milkshake both are nouns.

Word	Noun	Adjective	Verb	Adverb
frappe	Yes	No	No	No
milkshake	Yes	No	No	No

As nouns, milkshake is a hypernym of frappe; that is, milkshake is a word with a broader meaning than frappe:

frappe: thick milkshake containing ice cream
milkshake: frothy drink of milk and flavoring and sometimes fruit or ice cream

Other hypernyms of frappe include milk shake, shake.

frappe (noun)	milkshake (noun)
a frozen dessert with fruit flavoring (especially one containing no milk)	frothy drink of milk and flavoring and sometimes fruit or ice cream
thick milkshake containing ice cream
liqueur poured over shaved ice