The phrase "is friends" can be interpreted in various ways, and there are many synonyms that can be used to describe this relationship. A few examples of synonyms that can be used for "is friends" include "is pals" which implies a relatively casual friendship, "is chums" which suggests a deep and long-lasting relationship, "is buddies" which is often used in a more masculine context, and "is mates" which is a common British English phrase. Other synonyms for "is friends" include "is close", "is tight", "is a companion", "is a confidant", and "is an ally". Each of these synonyms provides a slightly different nuance to the concept of friendship, but they all convey a positive and supportive relationship between individuals.