The term COBRA RELATIVE can be summarized by two crossword solutions: MAMBA (5 letters) and KRAIT (5 letters). Mamba is a genus of venomous snakes found in Africa and the Arabian Peninsula. There are four species of mamba, the most well-known being the black mamba, which is the longest venomous snake in Africa. The krait is a species of venomous snake found in South and Southeast Asia. It is a member of the cobra family and is considered to be one of the most dangerous snakes in the region.