Joint-fir is a type of coniferous tree that is also known as Douglas-fir. It is commonly found in western North America and is a popular species due to its strong and durable wood. However, there are several synonyms for the term "joint-fir" that are often used interchangeably. Some of these include oregon pine, red fir, and douglas spruce. These synonyms are often used in different regions and industries, but all refer to the same species of tree. Understanding these different names for joint-fir can be helpful when communicating about the tree's properties or uses.