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| channel; subway | |||
| tunnel A underground passageway, especially one for trains or cars that passes under a mountain, river or a congested urban area | |||
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| tunnel | |||
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| canal (تَمُرُّ فيهِ أَوعِيَةٌ أَو أَعْصاب) | |||
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| free-flow tunnel | |||
| نفق: 24 phrases in 7 subjects |
| Acridology | 1 |
| Electric machinery | 1 |
| Electric motors | 1 |
| Electricity generation | 1 |
| Forestry | 1 |
| Medical | 18 |
| Oil / petroleum | 1 |