Let's look at the word “aan” (आन), meaning “dignity/manner/moment”, created with an ‘alif madd’ and ‘nuun’:

Above: ‘alif madd’ + ‘nuun’ = “aan”

Let’s add a ‘pe’ in the mix and create the word “paan” (पान), meaning “betel-leaf”:

Above: ‘pe’ + ‘alif’ + ‘nuun’ = “paan”

And now, let’s look at a word with a ‘nuun Gunna’ in the end - the word “taabaa.n” (ताबाँ), meaning “lustrous”:

Above: ‘te’ + ‘alif’ + 'be' + 'alif' + ‘nuun Gunna’ = “taabaa.n”

Did you notice the difference in the sound created by the ‘nuun Gunna’ there?

Okay! So with those basics out of the way let’s make things more interesting and see what other words we can make.