coal tar

thick black sticky substance produced when gas is made from coal 煤焦油.

co-ordinate, co-ordinate clause, co-ordinate, coordinate, co-ordination, co-ordinator, co-pilot, copilot, co-religionist, coreligionist, co-respondent, corespondent, co-signatory, cosignatory, co-star, co-tenant, coach, coachman, coachwork, coagulant, coagulate, coagulation, coal, coal gas, coal oil, coal-black, coal-face (also face), coal-hole, coal-mine (also pit), coal-miner, coal-scuttle (also scuttle), coal-seam, coalesce, coalescence, coalfield, coalition, coaming, coarse, coarse fish, coarse fishing, coarsely, coarsen, coarseness, coast, coastal,