many:

Not many people have heard of her   

Barbara doesn't have many friends.

We have known each other many years.

But we have killed many sharks, you and I, and ruined many others 

I have got too many friends at school.
mush:

We spend much time on this experiment

There is not much juice in the glass. 

 I have not much money.

He did it much sooner than she had expected.

The animals avoided him as much as possible.