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grounds : 1507 phrases in 70 subjects |
| Aerodynamics | 1 |
| Agriculture | 5 |
| Airports and air traffic control | 6 |
| American usage, not spelling | 6 |
| Anatomy | 1 |
| Angling hobby | 1 |
| Animal husbandry | 1 |
| Archaeology | 1 |
| Astronautics | 58 |
| Automated equipment | 1 |
| Automobiles | 1 |
| Aviation | 167 |
| Botany | 3 |
| Business style | 11 |
| Chemistry | 4 |
| Cinematography | 2 |
| Communications | 13 |
| Construction | 24 |
| Diplomacy | 68 |
| Earth sciences | 2 |
| Ecology | 6 |
| Economics | 18 |
| Electronics | 2 |
| Environment | 7 |
| Explosives and Explosive Ordnance Disposal | 2 |
| Figurative | 9 |
| Finances | 8 |
| Forestry | 2 |
| General | 277 |
| Geology | 2 |
| Hobbies and pastimes | 2 |
| Human rights activism | 9 |
| Hunting | 1 |
| ICAO | 2 |
| Industry | 2 |
| Informal | 3 |
| Information technology | 12 |
| Labor law | 1 |
| Law | 79 |
| Life sciences | 2 |
| Materials science | 1 |
| Mathematics | 1 |
| Mechanic engineering | 1 |
| Medical | 1 |
| Metallurgy | 1 |
| Meteorology | 5 |
| Microelectronics | 1 |
| Military | 518 |
| Mining | 1 |
| Missiles | 1 |
| Music | 1 |
| NATO | 1 |
| Natural resourses and wildlife conservation | 1 |
| Natural sciences | 1 |
| Nautical | 9 |
| Navigation | 9 |
| Oil and gas | 57 |
| Politics | 1 |
| Proverb | 22 |
| Road construction | 4 |
| Seismology | 1 |
| Skydiving | 1 |
| Space | 1 |
| Sports | 4 |
| Technology | 27 |
| Telecommunications | 1 |
| Textile industry | 1 |
| Transport | 10 |
| Weapons and gunsmithing | 1 |
| Zoology | 1 |