| Similarity | Rank | |
|---|---|---|
| nitrogen | 0.843 | 6386 |
| phosgene | 0.831 | 98640 |
| ethane | 0.831 | 70857 |
| benzene | 0.830 | 21692 |
| hydrocarbon | 0.824 | 12320 |
| monoxide | 0.822 | 12904 |
| nitrous | 0.817 | 29606 |
| hydrochloric | 0.816 | 22757 |
| tetrachloride | 0.816 | 38419 |
| &sub2; | 0.816 | 34174 |
| chlorine | 0.812 | 10537 |
| chlorinate | 0.807 | 31192 |
| nitric | 0.805 | 22052 |
| ammonia | 0.801 | 10958 |
| beryllium | 0.801 | 52345 |
| hexafluoride | 0.796 | 78594 |
| trioxide | 0.796 | 83599 |
| dioxide | 0.794 | 4762 |
| particulate | 0.794 | 25930 |
| sulphate | 0.792 | 9870 |
| oxide | 0.790 | 7892 |
| contaminant | 0.787 | 23773 |
| polycyclic | 0.786 | 68633 |
| ammonium | 0.786 | 22976 |
| hydrogen | 0.785 | 5285 |