| 空洞 | kong1 dong4 | cavity |
| 漏洞 | lou4 dong4 | gap |
| 洞 | dong4 | cave |
| 张之洞 | zhang1 zhi1 dong4 | Zhang Zhidong (1837-1909), prominent politician in late Qing |
| 洞穴 | dong4 xue2 | hole |
| 窑洞 | yao2 dong4 | yaodong (dugout used as shelter) |
| 洞口 | dong4 kou3 | tunnel entrance |
| 洞察 | dong4 cha2 | to see clearly |
| 洞房 | dong4 fang2 | bridal room |
| 黑洞 | hei1 dong4 | (astronomy) black hole |
| 洞窟 | dong4 ku1 | a cave |
| 山洞 | shan1 dong4 | mountain cave |
| 小洞 | xiao3 dong4 |