| morphine → IsA → drug | 0.52 | |
| morphine → IsA → opiate | 0.50 | |
| morphine → IsA → analgesic drug | 0.47 | |
| morphine → IsA → principal constituent of opium | 0.38 | |
| morphine → IsA → occurring substance | 0.25 | |
| morphine → IsA → the most commonly used drug | 0.25 | |
| morphine → IsA → sedative | 0.16 |