| conjugation | |
| consanguinity(noun, support, agreement, connection, association) | |
| consensus(noun, support, agreement, accord, harmony) | |
| constitutional government | |
| constitutional monarchy | |
| consumer cooperative | |
| cooperative society | |
| copartnership | |
| copartnery | |
| corporation(noun, organization, company, body, group) | |
| coterie(body, group, society, association, alliance) | |
| country(noun, organization, state, people, nation) | |
| coupling(combination, union, alliance, amalgamation, merger) | |
| credit union | |
| customs union | |
| dictatorship | |
| doing business with(expression, idiom, support, aid, service) | |
| dominion rule | |
| duarchy | |
| duumvirate |
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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> |