Colliers, sometimes referred to as coal miners or charcoal makers, are workers in the mining industry who extract or produce coal or charcoal. There are numerous synonyms for colliers, including coke burners, fuel extractors, carbon men, coal diggers, coal drivers, pitmen, coal-hewers, and even black diamonds. These terms reflect the different aspects of colliers' work, such as digging, extracting, burning, and transporting coal or charcoal. Some of these terms may have regional or historical variations, depending on the specific type of mining or production method used. However, all of these words refer to those who work in the coal or charcoal industry.