| centre |
| certainty(noun, principle, fact, reality, veracity) |
| certification(noun, information, reason, picture, evidence) |
| chapter and verse(noun, expression, idiom, feature, part) |
| character(noun, quality, spirit, significance, emotion) |
| chief constituent(noun, expression, quality, character, spirit) |
| chief part(noun, expression, facts, details, essentials) |
| chief thing(noun, expression, facts, details, essentials) |
| circumstantiality(noun, feature, part, plan, point) |
| clincher(noun, information, reason, picture, evidence) |
| clue(noun, information, reason, case, detail) |
| coal-and-ice(important, essential, critical, basic, fundamental) |
| coal and ice(noun, expression, idiom, law, important) |
| cold(adjective, basic, absolute, fundamental, key) |
| complete(adjective, basic, absolute, fundamental, key) |
| component(noun, feature, law, part, plan) |
| conceded fact |
| conclusion(noun, charge, understanding, agreement, essence) |
| congenital(adjective, basic, absolute, fundamental, key) |
| connate(adjective, basic, absolute, fundamental, key) |