The word "reusing" refers to the act of using an item or resource again, often after it has been used for its initial purpose. There are several synonyms for "reusing" that can be used to add variety to writing, such as "recycling," which connotes returning an item to its raw materials for production of another item. Another synonym is "repurposing," which suggests taking an item and using it in a different way than originally intended. "Upcycling" is a synonym that emphasizes the idea of making something new and improved out of something old or discarded. All of these synonyms for "reusing" capture the idea of using resources in a more sustainable and environmentally-friendly manner.