Aluminize refers to the process of coating or treating a surface with or in aluminum. If one wishes to use a synonym for aluminize, they may opt for terms such as aluminumize, metallize, or galvanize. These words all share similar meanings in the sense that they all refer to adding a layer of metal to a surface. Additionally, words such as plate, coat, and cover could also serve as synonyms for aluminize depending on the context in which the word is being used. Overall, there are several different words that can be used interchangeably with aluminize depending on the intended meaning and context of the term.