| Similarity | Rank | |
|---|---|---|
| warming | 0.731 | 6577 |
| cfc | 0.705 | 9251 |
| frost-free | 0.688 | 51431 |
| dioxide | 0.688 | 4762 |
| chlorofluorocarbon | 0.668 | 24061 |
| nitrogen | 0.660 | 6386 |
| ozone | 0.655 | 5037 |
| carbon | 0.652 | 3195 |
| nox | 0.648 | 28969 |
| co2 | 0.647 | 18793 |
| fossil-fuel | 0.640 | 76055 |
| refrigerant | 0.639 | 52632 |
| propagator | 0.635 | 40629 |
| spring-flowering | 0.634 | 84021 |
| bulb | 0.630 | 5922 |
| ammonia | 0.629 | 10958 |
| photosynthesis | 0.627 | 18251 |
| ozone-benign | 0.625 | 99646 |
| desulphurisation | 0.624 | 48583 |
| overgrazing | 0.622 | 43790 |
| hcfc | 0.621 | 89263 |
| halon | 0.620 | 27495 |
| sulphur | 0.620 | 6647 |
| antirrhinum | 0.619 | 79406 |
| ericaceous | 0.618 | 94824 |