However within roman catholicism, there is a difference between the two Here's a simple summary of the differences Here at anunslife.org, people from around the world gather to explore god’s calling in their lives. I don't think there is much of a difference Perhaps jetzt is more often used in spoken language, while nun is more often written than spoken, although there may well be regional differences If you must make a difference
Jetzt means right now, this instant where the meaning of nun is closer to presently or by now.
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