I've always called the part that swings out, and supports the cylinder, the CRANE.

I've seen that part elsewhere (i.e. S&W parts lists) called the YOKE.

Is it proper to use those terms interchangeably?

As a second, and somewhat related, question is there a specific reference that should be used to describe the area of the revolver frame that is opposite the crane/yoke? I'm referring to the area where the model number is usually stamped.