| Trad. | Simp. | Pinyin | English |
| 同 | tóng | like; same; similar; together; alike; with | |
| 同安 | Tóng ān | (N) Tong'an (place in Fujian) | |
| 同班同學 | 同班同学 | tóng bān tóng xué | classmate |
| 同伴 | tóng bàn | companion; comrade; fellow | |
| 同胞 | tóng bāo | fellow citizen or countryman | |
| 同胞兄妹 | tóng bāo xiōng mèi | sibling | |
| 同輩 | 同辈 | tóng bèi | peer |
| 同步 | tóng bù | synchronous | |
| 同步加速器 | tóng bù jiā sù qì | synchrotron | |
| 同步數位階層 | 同步数位阶层 | tóng bù shù wèi jiē céng | synchronous digital hierarchy; SDH |
| 同德 | Tóng dé | (N) Tongde (place in Qinghai) | |
| 同等 | tóng děng | (adj) having the same social class or status | |
| 同調 | 同调 | tóng diào | (math.) homology |
| 同福堂 | Tóng fú táng | Tung fook church | |
| 同構基本定理 | 同构基本定理 | tóng gòu jī běn dìng lǐ | isomorphism theorem |
| 同行 | tóng háng | (n) person in the same business or occupation | |
| 同化 | tóng huà | cultural assimilation | |
| 同化作用 | tóng huà zuò yòng | assimilation (biol.); anabolic | |
| 同濟大學 | 同济大学 | Tóng jì Dà xué | Tongji University |
| 同濟醫科大學 | 同济医科大学 | Tóng jì Yī kē Dà xué | Tongji Medical College |
| 同江 | Tóng jiāng | (N) Tongjiang (city in Heilongjiang) | |
| 同居 | tóng jū | cohabitating | |
| 同類 | 同类 | tóng lèi | (n) the same type |
| 同量異位素 | 同量异位素 | tóng liáng yì wèi sù | nuclear isobar |
| 同齡 | 同龄 | tóng líng | of the same age |
| 同盟 | tóng méng | alliance | |
| 同盟國 | 同盟国 | tóng méng guó | confederation |
| 同謀 | 同谋 | tóng móu | to conspire with someone; (be an) accomplice; to plot; (co)conspirator; partner in crime |
| 同年 | tóng nián | the same year | |
| 同配生殖 | tóng pèi shēng zhí | isogamy | |
| 同期 | tóng qī | the corresponding time period (e.g. compare inflation now with the rate during the same month last year) | |
| 同情 | tóng qíng | compassion; relent; sympathize; sympathy | |
| 同仁 | Tóng rén | (N) Tongren (place in Qinghai) | |
| 同仁堂 | Tóng Rén Táng | Tong Ren Tang | |
| 同上 | tóng shàng | (n) id idem | |
| 同時 | 同时 | tóng shí | at the same time; simultaneously |
| 同時代 | 同时代 | tóng shí dài | contemporary |
| 同時期 | 同时期 | tóng shí qī | at the same time; contemporary |
| 同事 | tóng shì | colleague; co-worker | |
| 同素異形體 | 同素异形体 | tóng sù yì xíng tǐ | allotropy |
| 同位 | tóng wèi | par | |
| 同位素 | tóng wèi sù | isotope | |
| 同位素分離 | 同位素分离 | tóng wèi sù fēn lí | isotopic separation |
| 同溫層巨人 | 同温层巨人 | tóng wēn céng jù rén | stratosphere giant |
| 同屋 | tóng wū | roommate | |
| 同心 | Tóng xīn | (N) Tongxin (place in Ningxia) | |
| 同行 | tóng xíng | journey together | |
| 同型配子 | tóng xíng pèi zǐ | isogamete | |
| 同型性 | tóng xíng xìng | isomorphism | |
| 同性 | tóng xìng | homosexual | |
| 同性戀 | 同性恋 | tóng xìng liàn | homosexual (love) |
| 同學 | 同学 | tóng xué | (fellow) classmate |
| 同樣 | 同样 | tóng yàng | same; equal; equivalent |
| 同業公會 | 同业公会 | tóng yè gōng huì | (n) trade association |
| 同一 | tóng yī | identical; the same | |
| 同意 | tóng yì | to agree; to consent; to approve | |
| 同義詞 | 同义词 | tóng yì cí | synonym |
| 同義字 | 同义字 | tóng yì zì | synonym |
| 同源 | tóng yuán | homology (biology) | |
| 同志 | tóng zhì | comrade | |
| 同質 | 同质 | tóng zhì | homogeneous |
| 同治陝甘回變 | 同治陕甘回变 | Tóng zhì Shǎn gān huí biàn | Dungan revolt |
| 同軸電纜 | 同轴电缆 | tóng zhóu diàn lǎn | coaxial cable |
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