The term 'Common Pet Rodent' can be summarized by the 6-letter word 'GERBIL'. Gerbils are small rodents that are commonly kept as pets. They are native to the deserts of Africa and Asia, and have become popular in many other parts of the world due to their friendly nature and ease of care. Gerbils are social animals and can live in groups, making them a great choice for families or people who want to keep multiple pets.