The crossword solutions for the term MARS OR JUPITER are PLANET (6 letters) and DEUS (4 letters). Mars and Jupiter are two of the eight planets in our Solar System. They are both classified as gas giants, meaning they are composed mostly of hydrogen and helium. Mars is the fourth PLANET from the Sun and is known for its red color, while Jupiter is the fifth PLANET from the Sun and is the largest PLANET in the Solar System. The word DEUS is Latin for God, which is a reference to the Roman gods associated with each PLANET.