Oxides refer to a group of chemical compounds that are formed by the reaction of oxygen with an element or a compound. There are different types of oxides such as metal oxides, non-metal oxides, acidic oxides, basic oxides, and peroxides. Synonyms for oxides can be categorized based on the type of oxide. For example, metal oxides can be referred to as metal-oxygen compounds, while non-metal oxides can be called non-metallic oxides. Acidic oxides can be described as acidic anhydrides or acid anhydrides, and basic oxides can be known as basic anhydrides. Peroxides can be considered as oxygen-donating compounds or oxidizing agents. Overall, there are several words that can be used instead of oxides depending on the context and type of oxide being referred to.