| cartel(body, group, society, class, association) |
| caucus(noun, group, mass, crowd, association) |
| chunk(noun, mass, growth, quantity, pile) |
| circle(noun, set, body, group, society) |
| clan(noun, set, group, crowd, band) |
| clique(noun, set, body, group, society) |
| club(noun, set, body, group, society) |
| combine(body, group, society, class, association) |
| combo(mass, accumulation, assortment, potpourri, hodgepodge) |
| complement(noun, crew, troop, staff, team) |
| composition |
| concentration(noun, group, mass, crowd, association) |
| concourse(noun, set, push, group, mass) |
| concurrence |
| confederation(body, group, society) |
| confluence |
| conglobation |
| congress(noun, group, mass, crowd, association) |
| conjunction |
| convention(noun, set, group, mass, crowd) |