The term "monkey wrench" is commonly used to describe a type of adjustable wrench. However, there are many other synonyms for this tool such as pipe wrench, adjustable spanner or Crescent wrench. These tools are used to grip and turn nuts, bolts, and fittings of various sizes. The term "monkey wrench" is derived from the name of the inventor, Charles Moncky who patented the tool in 1858. While the term monkey wrench is still used today, it is becoming less popular as more people use the alternative terms. These synonyms are often used interchangeably, but they may have distinct features that make them more suitable for specific tasks.