| Similarity | Rank | |
|---|---|---|
| carbon | 0.796 | 3087 |
| fuels | 0.794 | 9417 |
| petroleum-based | 0.790 | 79740 |
| fossil-fuel | 0.775 | 91442 |
| inorganic | 0.765 | 28012 |
| dioxide | 0.763 | 10273 |
| non-renewable | 0.759 | 56124 |
| energy-intensive | 0.753 | 95480 |
| biofuels | 0.753 | 26111 |
| hydrogen | 0.752 | 9917 |
| fossil | 0.745 | 9494 |
| nanotubes | 0.734 | 58295 |
| biofuel | 0.731 | 33305 |
| feedstocks | 0.731 | 76964 |
| gases | 0.728 | 11662 |
| polymers | 0.728 | 31022 |
| oxides | 0.726 | 42880 |
| cellulosic | 0.723 | 66673 |
| gaseous | 0.722 | 42339 |
| deuterium | 0.719 | 86208 |
| hydride | 0.718 | 95787 |
| gasses | 0.718 | 45276 |
| byproducts | 0.717 | 42005 |
| methane | 0.715 | 19799 |
| nanomaterials | 0.711 | 66739 |