| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | tugboat | United States | Tugboats are commonly used to assist large ships and barges in navigating through ports and waterways. | 1 |
| 2 | tugboat | United States | Commonly used for assisting large ships in harbors and navigating through narrow waterways | 1 |
| 3 | tugboat | United States | Tugboats are commonly used to assist large ships in harbors and ports. | 1 |
| 4 | tugboat | United States | Tugboats are commonly used to assist large ships in harbors and navigable rivers. | 1 |