Burn off is a phrasal verb that is commonly used to refer to the process of eliminating something by heating it until it evaporates or turns into ash. However, there are several other synonyms that can be used to convey the same meaning. Vaporize, for instance, refers to the process of converting a liquid or solid substance into a gas through heating. Incinerate is another synonym which means to burn something completely until it turns into ash. Combust, on the other hand, is used to describe the process of setting something on fire and seeing it burn away. These words can be used interchangeably with burn off, depending on the context in which they are used.