Beer's head is a term used to describe the foam or froth that forms at the top of a freshly poured beer. However, there are several other words that can be used to refer to this aspect of the beer. One synonym for beer's head is 'frothy cap,' which refers to the thick layer of foam that sits on top of the beer. Another term that can be used to describe beer's head is 'foam crown,' which is a reference to the regal appearance of the foamy layer. Additionally, 'creamy froth' is another synonym that can be used to describe the frothy layer that forms on top of the beer when it's poured.