clinker

n [U] rough stony material left in a furnace, etc after coal has burnt （熔炉等内的）熔渣, 渣块, 煤渣.

climatically, climatology, climax, climb, climb-down, climber, climbing-frame, clime, clinch, clincher, cline, cling, cling film, cling to, clinging, clingy, clinic, clinical, clinical thermometer, clink, clinker-built, Clinton, clip, clip-clop, clip-joint, clip-on, clipboard, clipper, clipping, clique, cliquy (also cliquey, cliquish), clitoral, clitoris, Cllr, cloak, cloak-and-dagger, cloakroom, clobber, cloche, clock,