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Can I do nomination on the same pokestop that I had already did which got accepted but not available in game?
No you cannot. While it may not be a Pokéstop (yet), it is probably active in another game, like Ingress. Nominating again will result in rejections as duplicate.
It depends. If it's not available because it was too close (<20 metres) to an existing wayspot, you can renominate. (If you can place it in a legitimate location that's outside the 20m range.)
If it's in Ingress, just not in Pokémon Go, you can't, because it will be marked as a duplicate.
Unfortunately the only way to check is to take a look in Ingress,