A cutthroat razor, also known as a straight razor, is a traditional shaving tool that has been around for centuries. However, there are several synonyms for this tool that are not as commonly used but still convey the same idea. For example, you may hear a cutthroat razor referred to as a barber's razor or an open razor. Other synonyms include a straight-edged razor, a straight-razor or even a cut-throat knife. Regardless of the name, this tool is known for its sharpness and precision, making it a popular choice for those looking for a close shave or a vintage grooming experience.