the italian way of saying "grandmother" or "grandma" is "nonna"
and it's pronounciation is "nohn-nah" notice the letter "h".speek it out with a little of the "h" in it
"Nonna" is the Italian word for grandmother. I am not sure about grandma, but I think is "nonnina". You may also try the dear grandmother, which is also colloquial: "cara nonna".