The hazel tree is a common shrub that grows in many parts of the world. It is known for its distinctive leaves and the nut it produces. There are many synonyms for the hazel tree, including the cobnut, the filbert, and the witch hazel. These names are used interchangeably depending on the region and context. The cobnut and filbert refer to the edible nuts produced by the tree, while the witch hazel is a plant with medicinal properties that is sometimes confused with the hazel tree. Despite the different names, the hazel tree remains an important species for its ecological and cultural significance.