We don't have synonyms for dhoon yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are hoon, doon and choon.
(n) :
(India, chiefly in the plural) Any of the flat valleys lying parallel to the base of the Himalayas, and between the rise of that mountain mass and the low tertiary ranges known as the sub-Himalayan or Sivalik Hills, or rather between the interior and exterior of these ranges.
(n) :
(India, chiefly in the plural) Any of the flat valleys lying parallel to the base of the Himalayas, and between the rise of that mountain mass and the low tertiary ranges known as the sub-Himalayan or Sivalik Hills, or rather between the interior and exterior of these ranges.