| Answer | Crossword Clue |
|---|---|
| squared | to make square or rectangular square a building stone |
| knapped | Shape (a piece of stone, typically flint) by striking it so as to make stone tools or weapons or to give a flat-faced stone for building walls |
| knapping | Shape (a piece of stone, typically flint) by striking it so as to make stone tools or weapons or to give a flat-faced stone for building walls |
| aggregate | Pieces of broken or crushed stone or gravel used to make concrete, or more generally in building and construction work |
| aggregates | Pieces of broken or crushed stone or gravel used to make concrete, or more generally in building and construction work |
| flagstone | A flat stone slab, typically rectangular or square, used for paving |
| flagstones | A flat stone slab, typically rectangular or square, used for paving |
