The term BLACK ___ (DEADLY AFRICAN SNAKE) is solved by the word MAMBA, a five-letter word. The mamba is a genus of venomous snake found in parts of sub-Saharan Africa. It is one of the most feared and deadliest snakes in the world, with some species capable of killing a human within 20 minutes of being bitten. The mamba is a long, slender snake that can grow up to 14 feet in length. Its coloration ranges from dark green to black, hence its name.