| Similarity | Rank | |
|---|---|---|
| undergravel | 0.859 | 19259 |
| reverse-flow | 0.848 | 72940 |
| aeration | 0.846 | 27937 |
| powerhead | 0.799 | 31085 |
| nitrite | 0.786 | 23744 |
| aquaclear | 0.785 | 94537 |
| anaerobic | 0.767 | 19094 |
| flocculation | 0.762 | 62174 |
| heaterstat | 0.751 | 47719 |
| mulm | 0.745 | 61594 |
| pre-filter | 0.744 | 46642 |
| filter | 0.729 | 2904 |
| substrate | 0.728 | 10262 |
| siporax | 0.728 | 38515 |
| oxygenate | 0.725 | 30777 |
| denitrification | 0.724 | 47547 |
| fluval | 0.721 | 39608 |
| sinter | 0.720 | 45873 |
| refrigerant | 0.719 | 52632 |
| eheim | 0.719 | 68668 |
| formaldehyde | 0.719 | 23163 |
| degreaser | 0.716 | 44543 |
| softener | 0.716 | 38621 |
| flocor | 0.714 | 68145 |
| permanganate | 0.714 | 43027 |