The term CUD CHEWER is composed of three crossword solutions: COW (3 letters), RUMINANT (8 letters), and DEER (4 letters). COW refers to a domesticated bovine, which is a type of RUMINANT mammal. RUMINANT is an even broader term that describes any hoofed mammal that chews its cud, such as cows, sheep, goats, and DEER. Finally, DEER is a species of RUMINANT mammal that is found in many parts of the world. All of these animals are cud chewers, meaning they regurgitate their food and chew it again before swallowing.