Whiffletree is a term that refers to the horizontal bar used to connect the harnesses of a draft horse or work animal. Some of the synonyms for whiffletree include evener, doubletree, and even-bar. Other similar terms include tug bar, pole, and tongue. These are often interchangeable depending on the region and use of the equipment. It is important to note that the use of these terms may differ slightly depending on the specific purpose, such as logging or plowing. Whatever the terminology used, a whiffletree or its synonym remains an essential tool in heavy farming and transportation tasks.