Sannup is a Native American term that refers to a man who is a close or intimate friend. However, there are several other synonyms for the word "sannup" that can be used depending on the context. Some of these synonyms include "companion," "confidant," "partner," "ally," "mate," and "brother." These words can be used to describe a platonic relationship between two people who share a deep connection and trust. They can also be used to describe a romantic relationship between two individuals who share a strong bond. Ultimately, the choice of synonym depends on the tone and meaning of the sentence being expressed.