Things that are not useful or not needed.
Nonuses are usually things that just take up space and don't help with anything.
Examples:
The broken toy is a nonuse now.
We should get rid of all the nonuses in the garage.
She keeps a lot of nonuses in her room.
The old computer is just a nonuse.
There are so many nonuses in the attic.
The nonuse takes up too much space.