The definition of a best friend is a person who you value above other friends in your life, someone you have fun with, someone you trust and someone in whom you confide.
Be friends with, hang around with.
The definition of a confidant is a friend who you can trust, who you tell secrets.
Find another word for bosom-friend. In this page you can discover 9 synonyms, antonyms, idiomatic expressions, and related words for bosom-friend, like: bosom-buddy, intimate friend, close friend, best-friend, dear friend, pal, soul-mate, companion and confidant.