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| Regius | |||
| English thesaurus | |||
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| R; Roy | |||
| royal: 76 phrases in 12 subjects |
| Agriculture | 1 |
| Amphibians and reptiles | 2 |
| Biology | 21 |
| Botany | 2 |
| Entomology | 1 |
| Forestry | 2 |
| Ichthyology | 17 |
| Mammals | 2 |
| Natural resourses and wildlife conservation | 3 |
| Natural sciences | 3 |
| Ornithology | 9 |
| Zoology | 13 |