A lodge is a subdivision of a tribe, with specific beliefs and goals shared among its members. They share a larger goal in common with the parent tribe, but have specific beliefs that may not be shared by all members. An analogy is a tribe as Christianity, while each lodge represents a specific Christian sect such as Catholicism, Baptism, Anglicans, and the like.
Additionally, some few lodges cross tribal boundaries. Analogous to how Christianity originally an offshoot of Judaism, transcended to become a seperate religion.