Tree-snake is a term used to describe two species of venomous snakes found in Africa, the Mamba (5 letters) and the Boomslang (9 letters). The Mamba is a large, fast-moving snake that can grow up to 4.5 meters in length and is considered one of the most dangerous snakes in the world. The Boomslang is a smaller, arboreal species that can reach lengths of 1.5 meters and is known for its bright green coloration. Both species are highly venomous and should be avoided.