The counterpart of Venus is MARS, which is a 4-letter word. MARS is the fourth planet from the Sun and is often referred to as the Red Planet due to its reddish appearance. It is the second smallest planet in the Solar System and is known for its dusty atmosphere and two moons, Phobos and Deimos. MARS is also known for its many craters and canyons, as well as its volcanoes, such as Olympus Mons, the largest volcano in the Solar System.