A method is provided for forming an entity cluster. In this method, a plurality of entities found in one or more data sources are identified. An entity may represent a word or a phrase found in the one or more data sources. The plurality of entities may then be organized into groups, where each group has a master entity and a set of subordinate entities. The groups are formed using a first comparison criteria. Then, using a second comparison criteria, a first group is associated with a second group. The second comparison criteria may compare the master entities associated with the first and second groups. Based on the association between the first group and the second group, the method can then determine that the first entity is related to the second entity.