| Similarity | Rank | |
|---|---|---|
| chlorinate | 0.822 | 31192 |
| sulphate | 0.813 | 9870 |
| nitrite | 0.811 | 23744 |
| groundwater | 0.797 | 12650 |
| tapwater | 0.797 | 27084 |
| ddt | 0.796 | 35026 |
| lindane | 0.795 | 67136 |
| ammonia | 0.784 | 10958 |
| phosphate | 0.782 | 8340 |
| acidify | 0.780 | 28689 |
| ammonium | 0.778 | 22976 |
| acidification | 0.774 | 21870 |
| dioxin | 0.773 | 17452 |
| eutrophication | 0.771 | 42648 |
| organochlorine | 0.770 | 48475 |
| flocculation | 0.768 | 62174 |
| nitrogen | 0.765 | 6386 |
| contaminant | 0.761 | 23773 |
| pollutant | 0.755 | 10281 |
| soluble | 0.755 | 12020 |
| fluoride | 0.755 | 20440 |
| atrazine | 0.753 | 78097 |
| chlorine | 0.753 | 10537 |
| polychlorinate | 0.753 | 45744 |
| &sub2; | 0.752 | 34174 |