Clause says that federal laws are superior to state laws

Supremacy

Explanation:

Supremacy clause is one of the federal law, it declares the fact that laws and treaties of the federal government of the supreme law to which the judges of the supreme court are bound regardless of the state law in the contrary.

The clause comes under the Article  VI of the U.S. Constitution. The supreme clause indicates that the constitution and the law of the states will be the supreme laws of the land.