chalkboard

n = blackboard (black1).

chain, chain reaction, chain-gang, chain-letter, chain-mail, chain-saw, chain-smoke, chain-smoker, chain-stitch, chain-store, chair, chair-lift, chairman, chairperson, chairwoman, chaise longue, chalet, chalice, chalk, chalk-mark, chalkiness, chalky, challenge, challenged, challenger, challenging, chamber, chamber concert, chamber music, chamber of commerce, chamber of horrors, chamber orchestra, chamber-pot, chamberlain, chambermaid, chameleon, chamois, chamomile, champ, champagne,