| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | observation post | United States | Military or research facility used for surveillance and data collection. | 1 |
| 2 | observe | United States | Observing nature is a common pastime, with birdwatching and stargazing popular activities. | 1 |
| 3 | observed | United States | It is common to be observed by security cameras in public places for safety and security purposes. | 1 |
| 4 | observed | United States | Thanksgiving is observed on the fourth Thursday of November in the United States, and on the second Monday of October in Canada. | 1 |
| 5 | observer | US | Common for people to enjoy bird-watching and nature observation as a hobby | 1 |