glass also = kaanch (the material), or chashma (eye glasses), but yeah the drinking vessel is usually just called glass like "ek glass paani to do." You can also say 'magga' which is probably a desified way of saying 'mug'. An olden urdu way of saying it was "Aab-e-khora" but nobody really uses that anymore.
Wow never heard of that word! Urdu is indeed a very interesting language.
Magga is more punjabi-like.