Arch-enemy : শত্রুপ্রবর; বৈরীপ্রধান; ঘোর শত্রু;
Related Words
arcane  arch enemy  arch-enemy  archaean  archangel  archenemy  See Words Also In
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Appropriate Prepositions
Bare of(অনাবৃত, স্বল্প-সজ্জা): The trees of the forest are bare of leaves.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
Inferior to (নীচু/হীন): He is inferior to his neighbor.
Married to (বিবাহিত): Salma was married to a Govt. Officer.
Road to (উপায়/ রাস্তা): There is no easy road to learning.
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Idioms
At a round rate (at the fixed price – নির্ধারিত মূল্যে) Things are selling in the shop at a round rate.
At-fault (guilty-কিংকর্তব্যবিমূঢ়, অপরাধ, দোষ adj.) You are at fault.
Foul play (অসদাচারণ করা): We feared that he had met with foul play.
Hard nut to crack (কঠিন সমস্যা): The problem of adult education is really hard nut to crack.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.