"Oomoto" is a Japanese word that translates to "big origin" or "great source." Synonyms for this word may vary depending on the context in which it is used. Some related terms might include "source," "origin," "foundation," "powerhouse," or "root." These synonyms all relate to the idea that something is the basis or starting point for something else. In religious contexts, this word might be associated with a deity or spiritual entity, and synonyms could include "divine," "holy," or "sacred." Another synonym that might be associated with this word is "primal," which suggests a fundamental significance or importance.