Cup vs Glass

When to use each in English, with meaning, register, and examples.

Cup

Top 1,000 (very common)A1noun

Glass

Top 1,000 (very common)A1noun
 CupGlass
Pronunciation🇬🇧 /["/kʌp/"]/🇺🇸 /["/kʌp/"]/🇬🇧 /["/ɡlɑːs/"]/🇺🇸 /["/ɡlæs/"]/
MeaningA small container used for drinking, usually with a handle.A hard, transparent material used for making windows and containers.
ExampleI drank a cup of tea this morning.The window is made of glass.
RegisterNeutralNeutral
How commonTop 1,000 (very common)Top 1,000 (very common)
CEFR levelA1A1
Part of speechnounnoun
Collocationsempty, full, half-empty, fill, refill, drain, contain something, holder, a cup and saucer, strong, fresh, hot, offer somebody, make (somebody), pour (somebody), cup of, a nice cup of tea, challenge, knockout, American, win, lose, present (somebody with), competition, clash, match, the first, etc. round of the cup, challenge, knockout, American, win, lose, present (somebody with), competition, clash, match, the first, etc. round of the cup, empty, full, half-empty, fill, refill, drain, contain something, holder, a cup and saucerclear, coloured/​colored, opaque, piece, pane, sheet, blow, make, break, break, crack, shatter, beads, bottle, bowl, behind glass, on glass, under glass, brimming, full, half-empty, have, drink, sip, clink, in a/​the/​somebody’s glass, glass of, (a) glass in (your) hand
Antonymsbowl, gobletopaque, solid
Common mistakesConfused with 'mug' — remember, a mug is usually larger and doesn't always have a handle., Using 'cup' to refer to a large container; 'cup' usually means a smaller one., Overgeneralizing to all drinking vessels — a 'cup' is specific.Confusing 'glass' with 'glasses' for the plural of drinking containers., Using 'glass' instead of 'glaze' when referring to pottery., Mispronouncing 'glass' as 'glance'.
Usage notesUsed in both everyday and formal contexts. Avoid using it in very technical or academic situations unless referring to a specific measurement. Generally, appropriate in any conversation about food or drink.Use 'glass' to refer to the material or objects made from it, like cups or windows. Avoid using it in very technical contexts without specifying what type (e.g. 'safety glass').

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Glass

Frequently asked questions: Cup vs Glass

What's the difference between Cup and Glass?

Cup: A small container used for drinking, usually with a handle. Glass: A hard, transparent material used for making windows and containers.

Are Cup and Glass the same CEFR level?

Cup: A1, Glass: A1 on the CEFR scale.

What part of speech are Cup and Glass?

Cup: noun, Glass: noun.

Can you show an example of each?

Cup: I drank a cup of tea this morning. Glass: The window is made of glass.

Can I use Cup and Glass interchangeably?

Not always. Cup and Glass are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.