A special interest group is an organized group of individuals who share a common goal or purpose. LOBBY is a five letter word for a group of people who attempt to influence public officials and government policy. SOCIETY is a seven letter word for an organized group of people with shared interests or beliefs. BLOC is a four letter word for a group of countries, political parties, or other organizations that act together in order to achieve a common goal. All of these terms are related to the term special interest group.