A clinker block is a type of brick that is discolored or misshapen due to over-burning. There are several synonyms for clinker block, including overburnt brick, black brick, burnt brick, and malformed brick. These bricks are typically used in construction projects where aesthetic value is not a concern, such as in the construction of walls or foundations. Clinker blocks are generally cheaper than regular bricks due to their imperfections, making them a popular choice for builders on a budget. Despite their unconventional appearance, clinker blocks are still a reliable building material and can effectively withstand weathering and other natural elements.