master, lord

owner

स्वामी

English Usage: The dominus of the estate ruled with authority.

Hindi Usage: संपत्ति का स्वामी अधिकार से शासन करता था।

sovereign

सरदार

English Usage: The emperor was referred to as the dominus of the empire.

Hindi Usage: सम्राट को साम्राज्य का सरदार कहा जाता था।