A common interest group is a group of people who share similar interests and goals. This type of organization is often formed to advocate for a specific cause or promote a common interest. There are many synonyms for a common interest group, including advocacy group, lobby group, special interest group, faction, caucus, and coalition. These terms all describe groups of individuals who have come together to address issues or work towards a common goal. No matter the name, these groups play an important role in our society by bringing attention to issues that might otherwise go unnoticed and giving a voice to those who might not have one.