naśladownictwo in English:

He compared the imitation with the original.

That's an imitation.

What is the difference between imitation and real diamonds?

Using a camera appeases the anxiety which the work driven feel about not working when they are on vacation and supposed to be having fun. They have something to do that is like a friendly imitation of work: they can take pictures.

Compare this genuine jewel with that imitation.

It's incredible that you could write such a well-designed program after just picking up programming by imitation.

On examination the jewel proved to be an imitation.