A predatory person, savagely cruel and ruthless in their treatment of others.
A carnivorous animal that hunts for its food, especially one that preys on vertebrates.
A subtle, treacherous, malicious person.
An obsolete wind instrument in the brass family, whose shape is suggestive of a snake (Wikipedia article).
A snake, especially a large or dangerous one.
A kind of firework with a serpentine motion.