Recently I posted a question to remove hindu as it makes no sense, same way, some users are tagging questions with hindi words, so we have to decide whether we are sticking with those, or we are going to mark them as synonyms?
Personally I think we should tag in English as much as possible, unfortunately we cannot use in few like gods names, for hell and heaven etc, but some tags are just getting duplicated badly, for example..
What they are using What should be there (They are already using some of these too)
(I don't think this suits well here, so we should stick with yamaloka)
buddhism / the-buddha Off topic as we have a separate site for that now and for some reason
we need to ask a cross religion question than we should consider writing gautama-buddha instead of just
or better refer other-religions 
So as you see, so many tags are used on the left hand side are already duplicated, can be called as synonyms, but with two different languages, so please decide are we going to stick with the Hindi versions or with the English ones.
Please edit the post only if you are good with formatting skills as too many
are used which may spoil the formatting, so don't do it unless you are sure enough to handle the formatting, a comment will be helpful too :)
Don't get confused with the tags at the bottom, they are not the part of the actual answer :)