What is that word and how does its omission in Amendment X make its meaning different from Article II?

The Word "expressly" is notably absent in the Tenth Amendment compared to Article II of the U.S. Constitution. Its omission alters the interpretation of states' rights and powers; while Article II specifies that powers not delegated to the federal government are reserved for the states, the Tenth Amendment reinforces the idea that states retain all powers not explicitly granted to the federal government. This difference emphasizes a broader interpretation of state authority in the Tenth Amendment, allowing for more flexibility in how powers are understood and exercised.