Buff(noun)
A person who is enthusiastically interested in and very knowledgeable about a particular subject.
Hindi meaning:बहुत ज़्यादा दिलचस्पी रखने वाला
Synonyms: Enthusiast, Fan, Admirer, Addict
Antonyms: Critic, Antagonist
Example: It's the perfect partner for workout enthusiasts and exercise buffs! <br><br> An evening for film buffs and all those interested in exploring the elusive, unending question of the Indian identity. <br><br> You don't need to be a film buff to enjoy the movies or a football fanatic to watch a game.
Trick to remember: Kisi ki cricket buff hone ki zaroorat nahin hai match dekhne ke liye, har koi samajh sakta hai game ko. 
