Meaning of the Sanskrit Word: sudrasya

  śūdrasya—of the śūdra    Bg 18.44
  śūdrasya—of the fourth-grade persons, the workers    SB 7.11.15
  śūdrasya—of the śūdra (the fourth grade of man in society, the worker)    SB 7.11.24

Can't find any compound Sanskrit words containing sudrasya.