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• The study or theory of knowledge is called "Epistemology".

• Epistemology (Noun)
- English Meaning: The study or theory of knowledge, especially with regard to its methods, validity, and scope, and the distinction between justified belief and opinion.
- Bangla Meaning: জ্ঞানতত্ত্ব।

• Other options:
ক) Psychology:
- English Meaning: The science of mind and behavior.
- Bangla Meaning: মনোবিদ্যা; মনোবিজ্ঞান।

গ) Etymology:
- English Meaning: The study of the origin and history of words, or a study of this type relating to one word.
- Bangla Meaning: শব্দের উৎপত্তি ও ইতিহাসসংক্রান্ত বিজ্ঞান।

ঘ) Philology:
- English Meaning: The study of language; the branch of knowledge that deals with the structure, historical development, and relationships of a language or languages.
- Bangla Meaning: ভাষাবিজ্ঞান; ভাষাতত্ত্ব।

Source:
1. Oxford Dictionary.
2. Merriam-Webster Dictionary.