| VOLCANO | Olympus Mons, located on Mars, is the largest one of these in our solar system |
| WAR | Mars is the Roman god of it |
| CURIOSITY | Rover, on Mars, is lethal to cats (9) |
| PLANET | Jupiter is the largest one in our solar system (6) |
| OPAL | The Olympic Australis is the largest one in the world |
| FRAT | Sigma Alpha Epsilon is the largest one in the US, for short |
| TREE | General Sherman is the largest one in the world (275 feet tall, weighing over 6,000 tons) |
| WOODENCHURCH | Eglise Sainte-marie in Nova Scotia is the largest one in North America: 2 wds. |
| TOMB | The Pyramid of Khufu is the largest one by volume |
| ORGAN | The skin is the largest one in humans |
| LEGOSET | The World Map is the largest one to date, with 11,695 pieces |
| TIDALRANGE | The Bay of Fundy has the largest one in the world |
| EYE | A giant squid has the largest one on the planet, about the size of a human head |
| MALL | The largest one in the U.S. is in Bloomington, Minn. |
| GEYSER | Geothermal eruption - Pohutu is the largest one in Rotorua |
| NATIONALFOREST | *Tongass in Alaska is the largest one |
| MAMMAL | The blue whale is the largest one |
| BIGCAT | The Siberian tiger is the largest one |
| CANTON | Graubunden is the largest one by area in Switzerland (6) |
| MARS | Site of Olympus Mons, the highest volcano in the solar system |
