improving同improvement有咩分別?

Improvement is a noun.
Improving is the present participle of improve (verb).

There is room for further improvement in your English.
There is room for improving your English.

Improvement on/in/to something

Don’t try to replace improvement with improving if that calls for a noun. In
English, we use present participle as a noun if there is no equivalent noun. e.g. reading.

The money will go into improving the facilities.
You can use the money for improving your house.
The patient shows no sign of improving. (or improvement)

Are you making some improvements on your house?
There is a big improvement in your English.
The kitchen is in need of improvements.