| 牢 | 牢 | cattle pen, prison | lao2 |
| 牢固 | 牢固 | firm, secure | lao2 gu4 |
| 牢记 | 牢記 | remember well | lao2 ji4 |
| 牢牢 | 牢牢 | firmly, safely | lao2 lao2 |
| 牢骚 | 牢騷 | grumbling, complaint | lao2 sao1 |
| 牢狱 | 牢獄 | prison, jail | lao2 yu4 |
| 坐牢 | 坐牢 | be in prison | zuo4 lao2 |
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