Demetallization refers to the process of removing metal from a substance or material. There are a variety of different words that can be used as synonyms for this term, including de-metalization, metal extraction, metal removal, and metal elimination. These words all refer to the same process of removing metal from a substance or material, and they can be used interchangeably in most cases. Other related terms include deoxidization, which is the process of removing oxygen from a material, and decontamination, which refers to the process of removing contaminants from a substance. Ultimately, the choice of which synonym to use will depend on the context in which the term is being used and the preferences of the speaker or writer.