This is the 6350th most frequent Korean word.
아이스
"Ice" (used for ice or iced in drinks, borrowed from English).
'아이스' here functions as a prefix indicating something is cold, specifically the coffee.
나는 점심 후에 아이스커피를 마셨어.
I drank an iced coffee after lunch.
'아이스' is part of a compound noun describing something made of ice or frozen, specifically the ice cream cake.
아이스크림 케이크를 생일 케이크로 주문했어요.
I ordered an ice cream cake for the birthday cake.
'아이스' qualifies the drink to denote it's served cold, enhancing the noun '음료' or 'drink'.