| A | B |
| casement | a window that opens on hinges along its side, like a door |
| casual | happening by chance; accidental; informal |
| catastrophe | a sudden widespread disaster; a misfortune; a calamity |
| ceremony | a ritual; a formal act for special occasions |
| chronic | long lasting; recurring often; constant |
| circumnavigate | to sail or travel completely around something |
| coerce | to compel; to dominate or restrain by force |
| coherent | logically connected; consistent; sticking together |
| colossal | huge; gigantic; vast; extraordinary |
| concerted | mutually agreed upon; done together; combined |