How do you say killer in Hindi?
— हत्यारा (hatyārā)

Generic synonyms for killer in Hindi
personमनुष्य (m) (manuṣya); शख़्स़ (m) (śaxsa); (m) (śakhsa)जन (m) (jana); व्‌यक्‌ति (m) (vyakti); व्यक्ति (m) (vyakti)
soulआत्मा (f) (ātmā)
Specialized synonyms for killer in Hindi
murdererहत्यारा (hatyārā)
Derivative terms for killer in Hindi
killमार डालना (mār ḍālana); मारना (mārnā)