| dòng | cave/hole/zero (unambiguous spoken form when spelling out numbers)/CL:個|个[ge4] |
| 洞 | cave hole zero (unambiguous spoken form when spelling out numbers) |
| 洞口 | Dongkou county in Shaoyang 邵陽|邵阳 |
| 洞口县 | Dongkou county in Shaoyang 邵陽|邵阳 |
| 洞天 | paradise heavenly or beautiful place fairyland |
| 洞天福地 | cave heaven and blessed regionland; a heavenly abode |
| 洞头 | Dontou county in Wenzhou 溫州|温州 |
| 洞头县 | Dontou county in Wenzhou 溫州|温州 |
| 洞子 | hole |
| 洞孔 | hole |
| 洞察 | to see clearly |
| 洞察一切 | to see everything clearly |
| 洞察力 | insight |
| 洞察秋毫 | to be perceptive of the minutest detail |
| 洞府 | cave-dwelling |
| 洞庭湖 | Dongting Lake in northeast Hunan province |
| 洞开 | to be wide open |
| 洞彻 | understand thoroughly; see clearly |
| 洞悉 | to clearly understand |
| 洞房 | secret inner room bridal room |
| 洞房花烛 | bridal room and ornamented candles wedding festivities (idiom) |