One who takes delight in excessive cruelty. Choose the most suitable ‘one word’ for the given expressions -

Sadist (noun)
Meaning: A person who derives pleasure, especially sexual gratification, from inflicting pain or humiliation on others.
Bengali Meaning: অত্যধিক নির্মমতা এবং তাতে আনন্দলাভ/ধর্ষকামী।
Example Sentence: A passionate defender of family values in his films, he was frequently a sadist on the set.

Source: Oxford Dictionary & Bangla Academy Dictionary.