The phrase "one friends" referring to a person's only friend is quite uncommon in English, and is actually incorrect grammatically. However, some synonyms for the word "one" could be "single", "sole", or "solitary". Similarly, synonyms for "friend" might include "companion", "confidant", "ally", "mate", or "buddy". Depending on the context, other phrases or terms could be used to describe a close friend, such as "best friend", "closest friend", or "dearest friend". Regardless of the phrasing, having even just one loyal friend can bring a great deal of joy and support to a person's life.