| cohort |
| colony(noun, crew) |
| combine(noun, organization, business, company, set) |
| combo(noun, organization, company, group, society) |
| conclave(group, party, section, council) |
| concourse(noun, set, meet, press, group) |
| condition(noun, company, place, position, circle) |
| confluence(noun, set, meet, press, group) |
| conflux(noun, set, meet, press, group) |
| congeries(noun, set, meet, press, group) |
| congress(noun, organization, company, society, union) |
| connection(noun, organization, business, company, place) |
| consort with |
| conspiracy(set, group, association, party, section) |
| conspirators |
| conventicle(noun, council) |
| convention(noun, set, group, crowd, band) |
| cooperative(noun, organization, business, company, body) |
| corporation(noun, organization, business, company, body) |
| cult(noun, group, party, faction, sect) |