Air punch is a term often used to describe a celebratory fist pump done with no actual contact. Some synonyms for air punch could include: fist pump, victory dance, celebratory gesture, triumphant punch, or even a "good job" high five. Other synonyms could be more specific to the context of the action, such as a sports-related "touchdown dance" or martial arts "victory shout." Ultimately, any term that describes a physical expression of excitement or triumph could potentially be used as a synonym for air punch.