>>forest was a perfectly good word why did they have to choose the Indian word Jungle?

Avy--I never knew 'jungle' came from India. Thanks. I can only guess that other English-speaking cultures have the same difference in meaning that we do.

If I see the word jungle, I think of the very heavy, lush, tangly green growths in tropical areas, usually heavy with humidity.

I think of a forest as being primarily a very large area covered with mostly trees. There may or may not be any underbrush to impede movement, but where there is, it won't
be as impassable as the undergrowth can be in a jungle.
And I'd say there usually isn't as much humidity, because if there were, the forest would probably be a jungle!