General:
* Space: This is the most straightforward option, but it can be vague.
* Roominess: This emphasizes the abundance of space.
* Expansiveness: This suggests a feeling of openness and vastness.
* Amplitude: This is more formal and suggests a large size.
Specific:
* Area: This is used for a defined section of space.
* Capacity: This refers to the amount something can hold.
* Volume: This is used for the size of a three-dimensional object.
* Dimensions: These are the measurements of size and shape.
Examples:
* "The house has a lot of space."
* "The car's roominess makes it ideal for families."
* "I was impressed by the expansiveness of the desert landscape."
* "The amplitude of the hall allowed for a large audience."
* "The area of the garden was perfect for a vegetable patch."
* "The capacity of the truck was enough to carry the entire load."
* "The volume of the room was impressive."
* "The dimensions of the box were perfect for the gift."
The best noun to use will depend on what you are trying to say and the specific context of your sentence.