Aprime minister differs from a president in the following ways

The term president and prime minister can be used interchangeably,but their role differ in context to different countries. The president is the head of the state while the prime minister is head of the government. As head of government prime minister leads the operations of the government while a president is the chief representative of the county and performs ceremonial duties. He welcomes foreign dignitaries and acts as the commander in chief of the government. The method of their elections also vary, presidents are elected by the people while prime ministers are chosen by the party members.

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.

under god i have placed my chiest strentgh and the safe guard to my loyal subjects