The term 'MERCURY'S GREEK COUNTERPART' can be answered with the 6-letter word 'HERMES'. In Greek mythology, HERMES was the messenger of the gods and the god of trade, thieves, travelers, sports, and athletes. He was the son of Zeus and Maia, and was known for his speed and cunning. He was also the patron of travelers, and was often depicted wearing winged sandals and a winged hat. He was associated with the planet Mercury, which is why he is considered to be Mercury's Greek counterpart.