Ballooner is a specific term that refers to someone who organizes or operates hot air balloons. However, there are a few synonyms that can also be used to describe someone who works in the hot air balloon industry. A balloonist is someone who pilots or flies hot air balloons. A balloon pilot is another term that can be used to describe someone who flies hot air balloons. Other synonyms for a ballooner could include a hot air balloon operator, a hot air balloon rider, or a hot air balloon enthusiast. These terms may not be as specific as ballooner, but they can all be used to describe someone who enjoys or works with hot air balloons.