Formal:
* सामाजिक कार्यकर्ता (Samajik Karyakarta) - This is the most common and formal term for "social worker."
* समाजसेवी (Samajsevi) - This term literally means "social servant" and is also widely used.
Informal:
* सोशल वर्कर (Social Worker) - This is the direct translation and is used in informal settings.
* समाज के लिए काम करने वाला (Samaj Ke Liye Kaam Karne Wala) - This means "one who works for society."
Other options:
* समाज सेवाकर्ता (Samaj Sewakarta) - This term emphasizes the service aspect of the profession.
* सामाजिक कल्याणकर्ता (Samajik Kalyan Karta) - This term highlights the focus on social welfare.
The best choice depends on the specific situation.