| 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 | Dongkou county in Shaoyang 邵阳 , Hunan; cave mouth; tunnel entrance | | |
| 3 | 洞穴 | 洞穴 | dòng xué | dong4 xue2 | cave; cavern | | |
| 4 | 洞窟 | 洞窟 | dòng kū | dong4 ku1 | a cave | | |
| 5 | 洞子 | 洞子 | dòng zi | dong4 zi5 | cave; pit; (coll.) greenhouse | | |
| 6 | 洞烛其奸 | 洞燭其奸 | dòng zhú qí jiān | dong4 zhu2 qi2 jian1 | to see through sb.'s villainy (idiom) | | |
| 7 | 洞中肯綮 | 洞中肯綮 | dòng zhòng kěn qǐng | dong4 zhong4 ken3 qing3 | to hit the nail on the head (idiom) | | |
| 8 | 洞螈 | 洞螈 | dòng yuán | dong4 yuan2 | olm (Proteus anguinus) | | |
| 9 | 洞泄 | 洞泄 | dòng xiè | dong4 xie4 | lienteric diarrhea (TCM) | | |
| 10 | 洞悉无遗 | 洞悉無遺 | dòng xī wú yí | dong4 xi1 wu2 yi2 | to understand thoroughly (idiom) | | |
| 11 | 洞悉其奸 | 洞悉其奸 | dòng xī qí jiān | dong4 xi1 qi2 jian1 | to see through a trick (idiom) | | |
| 12 | 洞悉 | 洞悉 | dòng xī | dong4 xi1 | to clearly understand | | |
| 13 | 洞头县 | 洞頭縣 | dòng tóu xiàn | Dong4 tou2 xian4 | Dontou county in Wenzhou 温州 , Zhejiang | | |
| 14 | 洞头 | 洞頭 | dòng tóu | Dong4 tou2 | Dontou county in Wenzhou 温州 , Zhejiang | | |
| 15 | 洞庭湖 | 洞庭湖 | dòng tíng hú | Dong4 ting2 Hu2 | Dongting Lake in northeast Hunan province | | |
| 16 | 洞天 | 洞天 | dòng tiān | dong4 tian1 | paradise; heavenly or beautiful place; fairyland | | |
| 17 | 洞若观火 | 洞若觀火 | dòng ruò guān huǒ | dong4 ruo4 guan1 huo3 | lit. to see sth as clearly as one sees a blazing fire (idiom); fig. to grasp the situation thoroughly | | |
| 18 | 洞口县 | 洞口縣 | dòng kǒu xiàn | Dong4 kou3 xian4 | Dongkou county in Shaoyang 邵阳 , Hunan | | |
| 19 | 洞孔 | 洞孔 | dòng kǒng | dong4 kong3 | hole | | |
| 20 | 洞开 | 洞開 | dòng kāi | dong4 kai1 | to be wide open | | |
| 21 | 洞鉴 | 洞鑒 | dòng jiàn | dong4 jian4 | insight; to see clearly; to examine deeply; to inspect closely | | |
| 22 | 洞府 | 洞府 | dòng fǔ | dong4 fu3 | cave dwelling; legendary abode of immortals | | |
| 23 | 洞房花烛夜 | 洞房花燭夜 | dòng fáng huā zhú yè | dong4 fang2 hua1 zhu2 ye4 | wedding night | | |
| 24 | 洞房花烛 | 洞房花燭 | dòng fáng huā zhú | dong4 fang2 hua1 zhu2 | bridal room and ornamented candles; wedding festivities (idiom) | | |
| 25 | 洞房 | 洞房 | dòng fáng | dong4 fang2 | secret inner room; bridal room | | |