exchange

When used as a verb, "exchange" usually requires an object (e.g., "exchange gifts"). If you are talking about swapping one thing for another, use the preposition "for" (e.g., "I exchanged the shirt for a larger size"). As a noun, it can refer to a simple act of swapping or a formal organization like a stock exchange. When referring to the financial market, it is often capitalized if part of a specific name, such as the "New York Stock Exchange." Be careful not to confuse "exchange" with "change." While both involve getting something different, "exchange" implies a mutual swap or a trade of equal value.