Single-jets are a type of aircraft engine that has only one exhaust nozzle. However, there are several different synonyms for the term "single-jets" that are commonly used within the aviation industry. One such synonym is "single-engine," which refers to aircraft that are powered by just one engine rather than multiple engines. Another synonym is "mono-jet," which is a term that specifically refers to a single-jet engine that is used in smaller aircraft. Finally, "twin-jet" is a term that is used to describe aircraft that have two engines, which is the opposite of a single-jet engine. These synonyms can be useful for pilots, engineers, and aviation enthusiasts who want to better understand the language and terminology used in the industry.