The term DIAMONDBACK, E.G. refers to a type of reptile, specifically a type of snake. The crossword solutions for this term are TERRAPIN (8 letters), RATTLESNAKE (11 letters), and RATTLER (7 letters). A TERRAPIN is a small, aquatic turtle, while a RATTLESNAKE is a venomous snake with a rattle at the end of its tail. A rattler is another name for a RATTLESNAKE. All three of these animals are members of the same family, and all three are found in North America.