The study of the origin and history of words, or a study of this type relating to one word -

• Etymology (Noun)
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।

• Entomology
English Meaning: the scientific study of insects
Bangla Meaning: পতঙ্গতত্ত্ব; কীটতত্ত্ব।

• Anthropology
English Meaning: Study of human origin and culture
Bangla Meaning: নরবিজ্ঞান; নরবিদ্যা; নৃতত্ত্ব।

• Epistemology
English Meaning: the theory of knowledge, especially with regard to its methods, validity, and scope, and the distinction between justified belief and opinion.
Bangla Meaning: জ্ঞানতত্ত্ব

Source: Oxford Learner's Dictionary and Bangla Academy Dictionary.