| Answer | Crossword Clue |
|---|---|
| undulation | a rising and falling in waves |
| undulations | UNDULATION, a rising and falling in waves |
| fluctuations | An irregular rising and falling in number or amount; a variation |
| fluctuation | An irregular rising and falling in number or amount; a variation |
| rollings | rising and falling in gentle slopes, as land |
| rolling | rising and falling in gentle slopes, as land |
