The term 'constant friends' can be replaced with a variety of synonyms, all of which have different connotations and shades of meaning. Some popular alternatives include 'loyal companions', 'steadfast allies', 'unwavering supporters', 'ever-present confidants', and 'faithful comrades'. Each of these terms emphasizes different aspects of a strong relationship, such as trustworthiness, loyalty, reliability, or emotional support. Choosing the right synonym depends on the context and tone of the piece of writing, as well as the specific nuances of the relationship being described. Regardless of the phrasing, the idea of a constant friend remains a cherished and valuable concept in any social context.