Glass vs Window

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

 GlassWindow
MeaningA hard, transparent material used for making windows and containers.An opening in a wall with glass to let light in.
CEFR levelA1A1
Part of speechnounnoun
Usage notesUse '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').Widely used in both casual and formal contexts. Avoid when talking about computer interfaces; specify 'computer window' instead.

Frequently asked questions: Glass vs Window

What's the difference between "Glass" and "Window"?

"Glass" means: A hard, transparent material used for making windows and containers. "Window" means: An opening in a wall with glass to let light in.

When should I use "Glass" and "Window"?

They can all be used in everyday English.

Are "Glass" and "Window" the same CEFR level?

"Glass" is at A1, "Window" is at A1 on the CEFR scale.

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