| Obstruction |
| Obstructions or obstacles |
| Drain obstruction |
| Artery obstruction |
| Cooler part / Obstruction |
| Remove obstructions |
| Create an obstruction, in a way |
| Barber's obstruction |
| Vent that's no longer an obstruction? |
| Basin obstruction |
| Obstructions |
| Artificial obstruction in a river |
| It penalizes obstruction of hydrants |
| Practice obstructionism |
| Breathing obstruction, sometimes |
| Breathing obstruction |
| Plumbing obstruction |
| Garden hose obstruction |
| Obstruction at the entrance to a cave, maybe |
| Ocean obstruction |
| Blood obstruction |
| Flow obstruction |
| Stream obstruction |
| Intestinal obstruction |
| Obstruction, as in a pipe |
| Vanishing obstruction in 1989 |
| Potential drain obstruction |
| Blood vessel obstruction |
| Internal obstruction |
| Sink obstruction |