frappe vs water ice

frappe and water ice both are nouns.

Word	Noun	Adjective	Verb	Adverb
frappe	Yes	No	No	No
water ice	Yes	No	No	No

As nouns, water ice is a hyponym of frappe; that is, water ice is a word with a more specific, narrower meaning than frappe:

frappe: a frozen dessert with fruit flavoring (especially one containing no milk)
water ice: an ice containing no milk but having a mushy consistency; usually made from fruit juice

Other hyponyms of frappe include sorbet.

frappe (noun)	water ice (noun)
a frozen dessert with fruit flavoring (especially one containing no milk)	an ice containing no milk but having a mushy consistency; usually made from fruit juice
thick milkshake containing ice cream	water frozen in the solid state
liqueur poured over shaved ice