The word 'Esoteric' is a/an -

• The word 'Esoteric' is an Adjective.

• Esoteric (adjective)
English Meaning: Intended for or understood by only a few people who have special knowledge.
Bangla Meaning: কেবল দীক্ষিত ব্যক্তিরা বুঝতে পারে এমন দুর্বোধ্য।

Other Forms: Esoterically (adverb).

Example Sentence:
1. Literary readings can sometimes seem esoteric, but we are trying to make them more attractive to more people.
2. I was amazed by seeing his collection of esoteric philosophical theories.

Source:
1) Website Lecture.
2) merriam-webster.