Cake part is a term used to describe the components of a cake. The three main parts are LAYER, TIER, and icing. LAYER is a 5 letter word that refers to the individual layers of cake that are stacked on top of each other. TIER is a 4 letter word that describes the multiple layers of cake that are stacked on top of each other. Icing is a 5 letter word that refers to the sweet coating that is spread over the cake.