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| carbon-nitrogen: 41 phrases in 14 subjects |
| Agriculture | 5 |
| Automobiles | 1 |
| Aviation | 2 |
| Chemistry | 2 |
| Desert science | 3 |
| Earth sciences | 5 |
| Ecology | 4 |
| Geology | 3 |
| Metallurgy | 1 |
| Oil / petroleum | 2 |
| Oil processing plants | 1 |
| Space | 2 |
| Technology | 9 |
| Water resources | 1 |
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