cup
- glass - mug
‘cup’
A cup is a small, round container, usually with a handle, from which you drink hot drinks such as tea and coffee. When you are not holding a cup, you usually rest it on a saucer.
John put his cup and saucer on the coffee table.
A cup is also a unit of measurement used in cooking.
Mix four cups of flour with a pinch of salt.
‘glass’
A glass is a container made out of glass and used for cold drinks.
I put down my glass and stood up.
He poured Ellen a glass of juice.
‘mug’
A mug is a large deep cup with straight sides and a handle, used for hot drinks. You don't rest a mug on a saucer.
He spooned instant coffee into two of the mugs.
containers and contents
You can use cup, glass, and mug to talk about either the containers or their contents.
I dropped the cup and it broke.
Drink eight glasses of water a day.