What are two coins and one of them is not a nickel?
Could you please clarify what you mean by "two coins and one of them is not a nickel"? Are you asking for an example of two different types of coins, where one of them is not a nickel, and the other could be any other type of coin? If so, here's an example: The two coins could be a quarter and a dime. In this case, the quarter is not a nickel, while the dime is another type of coin. Of course, there are many other possible combinations of coins that could fit this description.