Tadbhav Shabad: The words which were changed from Prakrit or Apabhrangsa and adopted in Bengali language at the time of formation of Bangla language are called Tadbhav Shabad. However , the root of the word tadbhav must be in Sanskrit. For example, the Sanskrit word 'hast' was used in Prakrit as 'hath'. And when it came to Bengal, it became easier to become a 'hand'. Similarly , tanner ˂ > leather ˂> leather .