| Similarity | Rank | |
|---|---|---|
| Chlorine | 0.800 | 54131 |
| Oxygen | 0.769 | 26251 |
| Dioxide | 0.766 | 69551 |
| Sulfur | 0.740 | 70589 |
| ozone | 0.736 | 18222 |
| Ammonia | 0.735 | 78473 |
| Hydrogen | 0.734 | 29099 |
| Pollution | 0.723 | 29306 |
| Ultraviolet | 0.717 | 62080 |
| Radon | 0.711 | 60232 |
| Vapor | 0.701 | 40797 |
| Radiation | 0.701 | 24967 |
| Methane | 0.701 | 69623 |
| Gases | 0.698 | 90904 |
| Water | 0.697 | 2787 |
| Radioactive | 0.695 | 64607 |
| Nitrogen | 0.692 | 45976 |
| Purifier | 0.691 | 87590 |
| Monoxide | 0.686 | 90956 |
| Osmosis | 0.684 | 88040 |
| Oxidation | 0.683 | 91986 |
| Peroxide | 0.681 | 71780 |
| Formaldehyde | 0.676 | 99913 |
| Fluoride | 0.675 | 54744 |
| Algae | 0.673 | 53993 |