If something is classable, it means it can be put into a group or category.
Being classable is usually a good thing because it helps us understand and organize things better.
Examples:
Animals are classable by what they eat.
Fruits are classable by their color.
The toys are classable by size.
Is this toy classable as a doll or a stuffed animal?
Everything in the world is classable in some way.
The books are classable by how long they are.