| concourse | a large open space where crowds gather |
| concur | agree |
| concurrent | ococuring in the same time |
| courier | one who carries messages |
| current | of air, water |
| cursive | handwriting with letters joined together |
| cursory | running over rapidly without pay attention to detail |
| discourse | formal and lengthy discussion of a subject |
| recourse | running back for help |
| recur | happen again |
| recurrent | returning repeatedly |