Download music from iPad to iPod nano
There are no ports in either machine?
They have a port to charge, and transfer data, and a 3.5m headphone port.
However, there is no way to directly transfer music from an iPad to an iPod regardless of ports.
If the music from the iPad, is no longer accessible on a computer, you will need to extract it from the iPad first, import it into iTunes on a computer, and then sync that library to the iPod.
See here: Recover your iTunes library from your iPod or iOS device - Apple Community
