Natural law refers to the set of principles that govern the universe and human behavior, which are believed to be inherent and unalterable. Synonyms for natural law include universal law, divine law, and eternal law. Universal law describes the concept that certain principles apply to all things, while divine law refers to the idea that these principles are set by a higher power. Eternal law suggests that these principles have always existed and will continue to exist. Other synonyms for natural law include moral law, cosmic law, and order of nature. These terms are often used interchangeably to describe the same basic idea of inherent principles that guide and govern the universe.