| 1 | 洞 | 洞 | dòng | dong4 | cave; hole; zero (unambiguous spoken form when spelling out numbers); Classifiers: 个 | | |
| 2 | 洞口 | 洞口 | dòng kǒu | Dong4 kou3 | cave mouth; tunnel entrance; Dongkou county in Shaoyang 邵阳 , Hunan | | |
| 3 | 洞穴 | 洞穴 | dòng xué | dong4 xue2 | cave; cavern | | |
| 4 | 山洞 | 山洞 | shān dòng | shan1 dong4 | cavern; cave | | |
| 5 | 黑洞 | 黑洞 | hēi dòng | hei1 dong4 | (astronomy) black hole | | |
| 6 | 空洞 | 空洞 | kōng dòng | kong1 dong4 | cavity; empty; vacuous | | |
| 7 | 漏洞 | 漏洞 | lòu dòng | lou4 dong4 | leak; hole; gap; loophole | | |
| 8 | 柏孜克里克千佛洞 | 柏孜克里克千佛洞 | bó zī kè lǐ kè qiān fó dòng | Bo2 zi1 ke4 li3 ke4 Qian1 fo2 dong4 | the Bezeklik Thousand Buddha Caves, in the Turpan Basin, Xinjiang | | |
| 9 | 空洞洞 | 空洞洞 | kōng dòng dòng | kong1 dong4 dong4 | empty; deserted | | |
| 10 | 孔洞 | 孔洞 | kǒng dòng | kong3 dong4 | small hole in an object | | |
| 11 | 洞房花烛夜 | 洞房花燭夜 | dòng fáng huā zhú yè | dong4 fang2 hua1 zhu2 ye4 | wedding night | | |
| 12 | 洞房花烛 | 洞房花燭 | dòng fáng huā zhú | dong4 fang2 hua1 zhu2 | bridal room and ornamented candles; wedding festivities (idiom) | | |
| 13 | 洞房 | 洞房 | dòng fáng | dong4 fang2 | secret inner room; bridal room | | |
| 14 | 钻洞 | 鑽洞 | zuān dòng | zuan1 dong4 | to bore; to burrow; to crawl through a tunnel | | |
| 15 | 洞察一切 | 洞察一切 | dòng chá yī qiè | dong4 cha2 yi1 qie4 | to see everything clearly | | |
| 16 | 洞察力 | 洞察力 | dòng chá lì | dong4 cha2 li4 | insight | | |
| 17 | 大浦洞二号 | 大浦洞二號 | dà pǔ dòng èr hào | Da4 pu3 dong4 er4 hao4 | Taepodong 2, North Korean rocket | | |
| 18 | 洞察 | 洞察 | dòng chá | dong4 cha2 | to see clearly | | |
| 19 | 大浦洞二 | 大浦洞二 | dà pǔ dòng èr | Da4 pu3 dong4 er4 | Taepodong 2, North Korean rocket | | |
| 20 | 大浦洞 | 大浦洞 | dà pǔ dòng | Da4 pu3 dong4 | Taepodong, North Korean rocket series | | |
| 21 | 大洞 | 大洞 | dà dòng | da4 dong4 | A large cave | | |
| 22 | 打洞 | 打洞 | dǎ dòng | da3 dong4 | to punch a hole; to drill a hole; to dig a hole; to burrow | | |
| 23 | 穿洞 | 穿洞 | chuān dòng | chuan1 dong4 | pierce | | |
| 24 | 柏克里克千佛洞 | 柏克里克千佛洞 | bó kè lǐ kè qiān fó dòng | Bo2 ke4 li3 ke4 qian1 fo2 dong4 | Paziklike thousand-Buddha grotto in the Turpan basin, Xinjiang | | |
| 25 | 别有洞天 | 別有洞天 | bié yǒu dòng tiān | bie2 you3 dong4 tian1 | place of charm and beauty; scenery of exceptional charm; completely different world | | |