Supersonic jets are commonly known as aircraft that fly at speeds greater than the speed of sound. However, there are several synonyms that one can use to describe these modern planes efficiently. Some of the common alternatives for supersonic jets are hypersonic jets, sonic jets, or high-speed planes. Another synonym for them is Mach jets. The word 'Mach' is used to describe the speed of sound and the planes that surpass it. Furthermore, the term 'afterburner jets' is also used to describe supersonic planes as they utilize afterburners to add extra thrust and accelerate to supersonic speeds. These synonyms are useful for writers or aviation enthusiasts who want to avoid repetition in their texts or conversations.