| HSK | Not in HSK |
|---|---|
| FREQUENCY | Unknown |
| 严 yán | strict, rigorous, rigid; stern |
| 重 zhòng | heavy, weighty; double |
| 急 jí | quick, quickly; urgent, pressing |
| 性 xìng | nature, character, sex |
| 呼 hū | breathe sigh, exhale; call, shout |
| 吸 xī | inhale, suck in; absorb; attract |
| 系 xì | system; line, link, connection |
| 统 tǒng | govern, command, control; unite |
| 综 zōng | arrange threads for weaving |
| 合 hé | combine, unite, join; gather |
| 症 zhèng | disease, illness, ailment |