Find the missing Word

Answer:
British.
Aryan.
Hinduism.
---Try those, if the answers are incorrect I'll try and find you another answer.---
Explanation:
" The four classes were the Brahmins (priestly people), the Kshatriyas (also called Rajanyas, who were rulers, administrators and warriors), the Vaishyas (artisans, merchants, tradesmen and farmers), and Shudras (labouring classes). "