| Answer | Crossword Clue |
|---|---|
| vallation | the act of building fortifications |
| vallations | VALLATION, the act of building fortifications |
| rubbles | broken fragments (as of rock) resulting from the decay or destruction of a building fortifications knocked into rubble C. S. Forester |
| rebuilding | the act of building again |
| nidification | the act, process or technique of building a nest |
| nidifications | NIDIFICATION, the act, process or technique of building a nest |
