"Boon fellows" is a phrase that is often used to describe close friends or companions who share a bond of trust and camaraderie. However, there are many other synonyms that can be used to describe this special relationship. Some examples include comrades, confidants, companions, allies, partners, pals, buddies, acquaintances, and peers. Each of these words carries its unique connotation and can be used in different situations to convey different shades of meaning. Whether you are describing a group of colleagues at work, a close-knit family, or a group of friends who have known each other for years, there is sure to be a synonym that perfectly captures the relationship and bond between them.