This is a bit more puzzling. I always thought mom and mum are the same. Apparently they aren't.
What's the difference? Do they have different meaning? Or is it a geographic difference? Is the pronounciation different?
The mysteries of the English language never cease to surprise me...
Well, over here in the US, mom is pronounced 'mahm', while mum is pronounced 'muhm'.
Mothers are called mom or 'mommy'.
if we here 'mum' we'll think of this:

and if we hear 'mummy' we'll think of this:
