Mason work is a type of construction job that involves the use of stone, brick, and other materials to build structures. The term 'mason work' can be broken down into two words: 'CASE' and 'cases'. The four-letter word 'CASE' refers to a box or container made of stone, brick, or other materials, while the five-letter word 'cases' refers to multiple boxes or containers made of the same material. Mason work involves the use of these materials to create structures such as walls, buildings, and monuments.