The term 'BIG SNAKE' can be broken down into three crossword solutions: BOA (3 letters), ANACONDA (8 letters), and ABOMA (5 letters). A BOA is a large, non-venomous snake found in tropical climates. An ANACONDA is a large, non-venomous snake found in South America. An ABOMA is a large, venomous snake found in Africa. All three of these snakes are considered to be big snakes, and they are all found in different parts of the world.