- accord: formal agreement
- concord: harmony, agreement
- concur: to agree
- concurrent: happening at the same time, parallel
- condescend: to stoop down to someone else’s level, usually in a offensive way
- condone: to overlook, to permit to happen
- conducive: promoting
- confluence: flowing together, especially rivers, the place where they begin to flow together
- congenial: agreeably suitable, pleasant
- congenital: describing a trait or condition acquired between conception and birth, innate (not caused by genes), sometimes means natural
- discord: disagreement