The Chinese word for classroom is
教室

jiào shì

Chinese Definition

classroom
1. 教室
2. 课堂
Components
教
1. to teach; to instruct
我來教jiāo 你。 - Let me teach you.
2. to provide guidance; to instruct
3. (obsolete or Min Nan) to tell (someone to do something); to let; to instruct
4. etiquette; rules; customs
5. religion; faith; religious teachings
你信什麼教？ - What is your religion?
6. to cause; to make
Synonyms: 叫
教人哭笑不得 -
室
1. room (in a building or house); chamber
兩室一廳 - two rooms and one living room
2. (specifically in addresses) apartment number; flat number
3. (literary, or in compounds) family; household; clan
4. (literary, or in compounds) family member; dependent
5. (specifically, literary, or in compounds) wife
6. (literary, or in compounds) organ (part of an organism) shaped like a chamber; body cavity; ventricle
7. (literary, or in compounds) work unit; administrative unit
8. (literary, or in compounds) court; dynasty
9. (literary, or in compounds) home; house
10. (literary, or in compounds) office
11. (literary, or in compounds) coffin pit; grave
12. (literary, or in compounds) scabbard; sheath
13. (astronomy) Encampment (a Chinese constellation near Pegasus)

教室
1. n. classroom

課堂
1. n. classroom
擾亂課堂秩序 - to disrupt classroom order
他講課的時候課堂上經常是空空如也。 - When he teaches, the classroom is often empty.