Famous explorer Dora is a four-letter word and refers to the Spanish explorer Dora de Perez, who was the first woman to circumnavigate the world in 1580. Columbus is an eight-letter word and refers to Christopher Columbus, an Italian explorer who sailed across the Atlantic Ocean in 1492 and discovered the Americas. Eric is a four-letter word and refers to Eric the Red, a Viking explorer who explored Greenland and parts of North America in the 10th century.