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| English thesaurus | |||
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| SB | |||
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Spectral : 93 phrases in 14 subjects |
| Acridology | 1 |
| Antennas and waveguides | 7 |
| Electronics | 7 |
| Environment | 1 |
| Forestry | 3 |
| International Monetary Fund | 2 |
| Lighting other than cinema | 29 |
| Mathematics | 8 |
| Metrology | 6 |
| Piezoelectric crystals | 1 |
| Radio | 2 |
| Radiology | 1 |
| Remote sensing | 20 |
| Vacuum tubes | 5 |