| English thesaurus | |||
| |||
| OG | |||
|
Observational : 32 phrases in 17 subjects |
| Astronomy | 2 |
| Biology | 1 |
| Business | 1 |
| Chemistry | 1 |
| Clinical trial | 1 |
| Communications | 1 |
| Economics | 5 |
| Environment | 1 |
| Geology | 1 |
| Health care | 1 |
| Life sciences | 1 |
| Mathematics | 2 |
| Measuring instruments | 1 |
| Natural sciences | 3 |
| Optics branch of physics | 8 |
| Pharmacy and pharmacology | 1 |
| Physics | 1 |