| propane → IsA → gas | 0.68 | |
| propane → IsA → approved, clean fuel | 0.57 | |
| propane → IsA → nontoxic fuel | 0.53 | |
| propane → IsA → hydrocarbon | 0.50 | |
| propane → IsA → a fossil fuel | 0.43 | |
| propane → IsA → the fuel of choice | 0.43 | |
| propane → IsA → clean fuel | 0.40 | |
| propane → IsA → a three-carbon alkane | 0.38 | |
| propane → IsA → safe fuel | 0.33 | |
| propane → IsA → versatile fuel | 0.32 | |
| propane → IsA → low-carbon alternative fuel | 0.25 | |
| propane → IsA → abundant bridge fuel | 0.22 | |
| propane → IsA → heavy gas | 0.20 | |
| propane → IsA → perfect fuel | 0.16 |