"My friend" is a commonly used phrase to refer to someone you are close to. However, if you are looking for other words that can be used in place of "my friend", there are many synonyms that can be used. Some examples of words that can be used instead of "my friend" include pal, buddy, mate, comrade, chum, cohort, confidant, ally, associate, and companion. These words are used frequently in informal settings, but can also be used in more formal contexts to refer to someone who is close to you. Ultimately, the choice of word will depend on the tone and level of formality required in the situation.