Is pie shell the same thing as crust?

Yes, "pie shell" and "crust" are essentially the same thing. They both refer to the pastry base that forms the bottom and sides of a pie.

Here's a subtle difference:

* Pie shell: Often refers to the *unbaked* pastry base.

* Crust: Can refer to both the *unbaked* and *baked* pastry base.

However, in everyday language, the terms are often used interchangeably.