The elderly woman in the village is an experienced buttermaker, and her handmade butter is especially popular.

buttermaker 是复合名词，由 butter（黄油）和 maker（制造者）组成。butter 指"黄油"，maker 来自动词 make（制作）加后缀 -er 表示"做...的人"。buttermaker 合起来指"制作黄油的人"或"黄油师傅"。