There are several synonyms for the phrase "pit coals," which refer to coals that are burned in a pit or underground oven. Some common synonyms include "barbecue coals," "charcoal briquettes," "grilling coals," and "campfire coals." These terms may vary in their meaning and context, but each describes a type of fuel that is commonly used in outdoor cooking, especially for grilling or barbecuing meats and vegetables. Other related synonyms for "pit coals" might include "firewood," "kindling," and "embers," which all refer to materials that can be used to start and maintain a fire in a cooking pit or oven.