| collegiality | |
| collusion(noun, support, agreement, connection, association) | |
| colonialism | |
| combined effort(expression, support, help, aid, service) | |
| commingling(noun, combination, blend, junction, coalition) | |
| common market | |
| communion(noun, support, help, aid, agreement) | |
| community(noun, organization, state, agreement, harmony) | |
| compact(noun, support, group, agreement, combination) | |
| complement(noun, collection) | |
| compound(noun, combination, association, blend, alliance) | |
| concert(support, help, aid, agreement, service) | |
| concord(noun, support, body, group, agreement) | |
| confraternity | |
| confunction(support, help, aid, service, assistance) | |
| congeries | |
| conglomerate(group, association, grouping) | |
| conglomeration | |
| congruity(noun, support, agreement, connection, association) | |
| conjoining(noun, combination, union, amalgamation) |
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| APA | Smart Define. (2015). federation thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/federation/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "federation thesaurus" https://smartdefine.org/federation/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, federation thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/federation/thesaurus/synonyms>. |
| MLA | Smart Define. "federation thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/federation/thesaurus/synonyms> |