Carbonisation is a process in which organic matter is converted into carbon through the process of heating in the absence of oxygen. The word "carbonised" is often used to describe this process. However, there are several other synonyms that can be used in place of "carbonised", such as "charred", "blackened", "scorched", and "decarbonised". In scientific terms, "pyrolysis" is also often used to describe the carbonisation process. The choice of synonym used will depend on the context of the sentence, as well as the tone and style of the writing. Overall, carbonisation is an important process that has many synonyms to describe it.