| Similarity | Rank | |
|---|---|---|
| conventional | 0.789 | 3644 |
| unconventional | 0.775 | 16566 |
| non-traditional | 0.710 | 25543 |
| Conventional | 0.676 | 23551 |
| alternative | 0.673 | 1513 |
| nontraditional | 0.666 | 48268 |
| conventionally | 0.654 | 37225 |
| methods | 0.634 | 1293 |
| complementary | 0.623 | 11847 |
| small-scale | 0.619 | 21894 |
| modalities | 0.618 | 21164 |
| energy-intensive | 0.617 | 95480 |
| Unconventional | 0.616 | 83484 |
| approaches | 0.615 | 3402 |
| high-yield | 0.615 | 62387 |
| high-technology | 0.614 | 76059 |
| fuels | 0.613 | 9417 |
| large-scale | 0.613 | 10507 |
| technologies | 0.611 | 2313 |
| biofuels | 0.611 | 26111 |
| techniques | 0.610 | 1524 |
| over-reliance | 0.610 | 95605 |
| feedstocks | 0.610 | 76964 |
| high-value | 0.607 | 38940 |
| combining | 0.606 | 7483 |