There are a few different synonyms that you might use for the word "bounceback," depending on the context in which you want to use it. One possibility is "recovery," which conveys the idea of returning to a previous state after experiencing setbacks or challenges. Another option is "resilience," which suggests the ability to withstand adversity and adapt to changing circumstances. "Recuperation" is a synonym that specifically refers to the process of recovering from illness or injury. "Rebound" or "comeback" can also be used to describe a situation in which someone or something recovers quickly after experiencing a setback.