The Chinese word for paintbrush is
漆刷

qī shuā

Chinese Definition

paintbrush
1. 画笔
Components
漆
1. (vern, lacquer tree); vern, varnish tree
2. varnish; lacquer; paint
3. to paint; to varnish
4. (literary) black; dark
5. (Name of several rivers.)
6. Only used in 漆漆
刷
1. brush (tool)
2. to brush; to scrub; to clean with a brush
3. to paint with a brush
4. (colloquial) to eliminate
5. (chiefly Mainland neologism colloquial) to browse through (updates on social media etc.); to flip through
刷手機 - to check one's phone (for updates on social media etc.)
這部電視劇太好看了！我已經開始四刷了！ - This television drama is so good! I have already begun to watch through it for the fourth time!
6. (colloquial) to write; to finish (a massive quantity of works)
7. (video games, transitive) to grind
刷錢 - to grind for in-game money
8. (video games) to spawn
刷車器 - car spawner
9. (dialectal) to pick; to choose