Institution: Bangladesh Development Bank Exam: Bangladesh Development Bank Ltd - Officer (Cash) - 15.01.2016
Topic: বাংলা সাহিত্য, Subject: Bangla Bengali literature (বাংলা সাহিত্য)

Best Answer Explained in Below-:

'রুপতত্ত্ব' (Rupatattva) refers to the study of the form and structure of language, particularly in terms of words and their meanings. In this context, 'শব্দ তত্ত্ব' (Shabdatattva), or the 'theory of words,' is the correct term that aligns with the concept of রুপতত্ত্ব.

Word theory focuses on the formation, usage, and semantics of words within a language. It explores how words are constructed, how they interact with one another within sentences, and how they convey meaning. The understanding of শব্দ তত্ত্ব is essential for grasping the nuances of language, as words are the fundamental building blocks of communication.

On the other hand, the other options—'বাক্য তত্ত্ব' (Sentence Theory), 'পদক্রম' (Morphology), and 'ধ্বনি তত্ত্ব' (Phonetics)—relate to different aspects of linguistics, such as sentence structure, morphological forms, and sounds in language, respectively. Therefore, among the given options, 'শব্দ তত্ত্ব' is the most appropriate synonym for 'রুপতত্ত্ব' as it captures the essence of word-based analysis pertinent to linguistic studies.