The term 'TYPE OF BLOCK' can be answered by two crossword solutions: MENTAL (6 letters) and CINDER (6 letters). MENTAL refers to a type of block that is related to the mind, such as a MENTAL block or a MENTAL barrier. CINDER refers to a type of block made from cinders, which are small pieces of burned coal, wood, or other combustible material. CINDER blocks are commonly used in construction for walls, foundations, and other structures.