The word "macks" is an informal term that can be used as a synonym for "men". However, there are several other terms that can be used interchangeably with "macks". These may include words like "guys", "dudes", "fellas", "blokes", "chaps", and "gentlemen". Depending on the context of the conversation, other terms like "boys", "lads", "cats", and "homies" might also come into play. It's important to note, however, that some of these terms may have different connotations or be more appropriate for certain situations than others. Therefore, it's always a good idea to consider context before using any synonym for "macks".