Sundarbans Bengali is settler speech. The islands were cleared and embanked largely from the nineteenth century onward by labour drawn from the eastern delta districts and from the Chota Nagpur plateau, and the resulting variety is eastern Bengali with a heavy working vocabulary that the standard has no words for — for the state of a tide, the age of a creek, the grade of a honey, the direction a tiger came from. Adivasi languages arrived with the clearing labour and survive in pockets. The single most striking feature is lexical taboo: in the forest, a set of ordinary words is replaced by others, because saying the plain word is held to bring the thing.
Sundarbans BengaliIndo-Aryan, Eastern
Eastern Bengali in its verb endings and vowels, drawn from Khulna, Jessore, Barisal and Faridpur speech, with a dense occupational vocabulary of tide, net, creek and forest.
बोलने वाले: The everyday speech of the islands
Standard BengaliIndo-Aryan, Eastern
The school, radio and market register, based on the Nadia–Kolkata variety of the western delta. The gap between it and island speech is wide enough that children meet a partly unfamiliar language on their first school day.
Munda and Santali pocketsAustroasiatic, Munda
Spoken by descendants of labour brought from the plateau for embankment and clearing work in the nineteenth and early twentieth centuries, in scattered settlements in the polder belt.
Musalmani registerIndo-Aryan, Eastern
The Perso-Arabic-vocabulary register of the puthi literature, which is also the register the Bonbibi Johuranama is written in — and which Hindu villagers reciting it therefore use without comment.