When we talk about friendship, we often think about having one true friend that we can rely on. However, there are many different ways to describe this type of friendship. Some synonyms for "one friend" may include "sparring partner," "confidant," "companion," "partner in crime," or "kindred spirit." Each of these describes a relationship in which one person trusts, enjoys spending time with, and feels understood by another person. Whether you're looking for someone to bounce ideas off of, share laughs with, or simply share your life experiences with, having one friend who truly understands you can make all the difference.