The best replacement for caste is class.

The best alternatives to caste are rated as following:
★★★★★  class
★★★  class system
★★  cast
★  varna
★  mixed race
  class systems
  open class

Your alternative for caste is not listed? Suggest!
Speaking about caste, one probably shouldn't forget about surname.

Other search terms related to caste and their ratings are:
★★★★★ surname
You have in mind a companion for caste and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of caste in all years. Click on graph for more.
caste
class
class system