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Rangpuri goes by numerous names. In Bangladesh, these include Rangpuri, Kamtapuri, Rajbongshi, and Polia. In India, there is Kamtapuri, Rajbongshi, Rajbanshi, Goalparia, Surjapuri, Koch Rajbanshi. In Nepal it is known as Rajbanshi or Tajpuriya. In Assam it is known as Koch-Rajbongshi and Goalpariya (which is also known as Deshi bhasha). In Bihar it is known as Surjapuri or Rajbanshi.
Dialects
The main dialects are Western Rajbanshi, Central Rajbanshi, and Eastern Rajbanshi.
The Central dialect has the majority of speakers and is quite uniform. There are publications in this language. The Western dialect has more diversity. Lexical similarity is 77 to 89% between the three dialects. Rajbonshi shares 48 to 55% of its vocabulary with Assamese and Bengali and 43 to 49% with Maithili and Nepali.
Comparison with related languages
English
Kamarupi
Rarhi
Vangiya
Kamtapuri
Assamese
Bengali
Sylheti
I do
Muĩ korong
Moe korü̃/korönɡ
Ami kori
Mui/Ami xori
I am doing
Muĩ koria asong
Moe kori asü̃/asöng
Ami korchi
Mui/Ami xoriar/xorram
I did
Muĩ korisong
Moe korisü̃/korisöng
Ami korechi
Mui/Ami xor(i)si
I did (perfective)
Muĩ korilung
Moe korilü̃/korilöng
Ami kôrlam
Mui/Ami xorlam
I did (distant)
Muĩ korisilung
Moe korisilü̃/korisilong
Ami korechilam
Mui/Ami xorsilam
I was doing
Muĩ koria asilung
Moe kori asilü̃/asilöng
Ami korchilam
Mui/Ami xorat aslam
I will do
Muĩ korim
Moe korim
Ami korbo
Mui/Ami xormu
I will be doing
Muĩ koria thakim
Moe kori thakim
Ami korte thakbo
Mui/Ami xorat táxmu
Notes
Hammarström (2015) Ethnologue 16/17/18th editions: a comprehensive review: online appendices