IPA: //ˈbʌtərˌkriːm//
KK: /ˈbʌtərˌkrim/
A sweet mixture made from butter and sugar, often used to cover or fill cakes and pastries.
She decorated the cake with a smooth layer of buttercream.
Buttercream is formed from "butter" (from Old English "butter", meaning a dairy product made from churning cream) and "cream" (from Old French "creme", meaning the fatty part of milk). The word refers to a sweet frosting made primarily from butter and cream.
Think of 'butter' as the dairy product and 'cream' as the fatty part of milk — together, they create a sweet frosting known as buttercream.
No commonly confused words.