Monolatry is the theological position that is a subdivision of polytheism. It teaches that of all the gods that exist, only one is served and worshiped. Monolatry is contrasted with henotheism which teaches that of all the gods that exist, one is supreme.
Mormonism is an example of a monolatristic religion. It teaches that many gods exist in the universe but only the God of this planet is worshiped.