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| English thesaurus | |||
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| NOW | |||
| Northern: 637 phrases in 41 subjects |
| Agriculture | 1 |
| American usage, not spelling | 1 |
| Amphibians and reptiles | 23 |
| Astronomy | 3 |
| Athletics | 1 |
| Biology | 4 |
| Botany | 1 |
| British usage, not spelling | 1 |
| Communications | 1 |
| Construction | 2 |
| Cooking | 1 |
| Earth sciences | 3 |
| Economy | 6 |
| English | 1 |
| Entomology | 9 |
| Environment | 5 |
| Finances | 1 |
| Fish farming pisciculture | 18 |
| Food industry | 22 |
| General | 158 |
| Geography | 8 |
| Health care | 2 |
| Ichthyology | 51 |
| International Monetary Fund | 1 |
| Law | 6 |
| Life sciences | 17 |
| Mammals | 101 |
| Medical | 12 |
| Natural resourses and wildlife conservation | 22 |
| Natural sciences | 18 |
| Nuclear physics | 2 |
| Optics branch of physics | 2 |
| Ornithology | 76 |
| Physics | 2 |
| Politics | 5 |
| Slang | 2 |
| Social science | 2 |
| Swimming | 1 |
| Technology | 1 |
| Transport | 2 |
| Zoology | 42 |