| 1 | 空气 | 空氣 | kōng qì | kong1 qi4 | air; atmosphere | | |
| 2 | 空间 | 空間 | kōng jiān | kong1 jian1 | space; room; (fig.) scope; leeway; (astronomy) outer space; (physics, math.) space | | |
| 3 | 空 | 空 | kōng | kong1 | empty; air; sky; in vain | | |
| 4 | 空中 | 空中 | kōng zhōng | kong1 zhong1 | in the sky; in the air | | |
| 5 | 空前 | 空前 | kōng qián | kong1 qian2 | unprecedented | | |
| 6 | 空军 | 空軍 | kōng jūn | kong1 jun1 | air force | | |
| 7 | 空虚 | 空虛 | kōng xū | kong1 xu1 | hollow; emptiness; meaningless | | |
| 8 | 空想 | 空想 | kōng xiǎng | kong1 xiang3 | daydream; fantasy; to fantasize | | |
| 9 | 空地 | 空地 | kōng dì | kong1 di4 | air-to-surface (missile) | | |
| 10 | 空洞 | 空洞 | kōng dòng | kong1 dong4 | cavity; empty; vacuous | | |
| 11 | 空话 | 空話 | kōng huà | kong1 hua4 | empty talk; bunk; malicious gossip | | |
| 12 | 空位 | 空位 | kōng wèi | kong1 wei4 | empty place; room (for sb) | | |
| 13 | 空中分列 | 空中分列 | kōng zhōng fēn liè | kong1 zhong1 fen1 lie4 | (military) flyover | | |
| 14 | 空号 | 空號 | kōng hào | kong1 hao4 | disconnected phone number; unassigned phone number | | |
| 15 | 空港 | 空港 | kōng gǎng | kong1 gang3 | airport (abbr. for 航空港 ) | | |
| 16 | 空想家 | 空想家 | kōng xiǎng jiā | kong1 xiang3 jia1 | impractical dreamer | | |
| 17 | 空口无凭 | 空口無憑 | kōng kǒu wú píng | kong1 kou3 wu2 ping2 | mere verbal statement cannot be taken as proof (idiom) | | |
| 18 | 空少 | 空少 | kōng shào | kong1 shao4 | airline steward (abbr. for 空中少爷 ) | | |
| 19 | 空洞洞 | 空洞洞 | kōng dòng dòng | kong1 dong4 dong4 | empty; deserted | | |
| 20 | 空心 | 空心 | kōng xīn | kong1 xin1 | hollow; (of vegetables) to become hollow or spongy inside; (of a basketball) to swish through (not touching the hoop) | | |
| 21 | 空对地 | 空對地 | kōng duì dì | kong1 dui4 di4 | air-to-surface (missile) | | |
| 22 | 空洞无物 | 空洞無物 | kōng dòng wú wù | kong1 dong4 wu2 wu4 | empty cave, nothing there (idiom); devoid of substance; nothing new to show | | |
| 23 | 空竹 | 空竹 | kōng zhú | kong1 zhu2 | Chinese yo-yo | | |
| 24 | 空窗期 | 空窗期 | kōng chuāng qī | kong1 chuang1 qi1 | window period (time between infection and the appearance of detectable antibodies); period during which sth is lacking (boyfriend or girlfriend, work, revenue, production of a commodity etc); lull; hiatus | | |
| 25 | 空城计 | 空城計 | kōng chéng jì | kong1 cheng2 ji4 | the empty city stratagem (in which Zhuge Liang presents himself as unperturbed while making it evident that his city is undefended, hoping his adversary will suspect an ambush); double bluff | | |