| falling(noun, drop, decline, fall, plunge) |
| grade(noun, drop, decline, fall, plunge) |
| gradient(noun, drop, decline, fall, plunge) |
| gulf(noun, dish, sink, dip, pot) |
| header(noun, drop, decline, fall, plunge) |
| hill(noun, drop, fall, plunge, slide) |
| hole(noun, drop, decline, fall, depression) |
| inclination(noun, drop, decline, fall, plunge) |
| incline(noun, drop, fall, plunge, slide) |
| lagoon(noun, dish, sink, pot, bowl) |
| landslide(noun, drop, decline, fall, plunge) |
| lapse |
| mining |
| pan(noun, dish, sink, pot, bowl) |
| plummeting(noun, drop, decline, fall, plunge) |
| plunge(noun, drop, decline, fall, slide) |
| plunging(noun, drop, decline, fall, plunge) |
| precipitation(noun, drop, decline, fall, plunge) |
| probing |
| prolapse(noun, drop, decline, fall, plunge) |