We know what pie is. Sometimes languages use the same word for two things. You can tell from context. We don't use pie for any of those other things you list.

We know what pie is. Sometimes languages use the same word for two things. You can tell from context. We don't use pie for any of those other things you list. It's either a pie (pumpkin, apple, pecan, etc), or a pizza. Your inner child needs to accept that some people speak different languages than you.