I may not express my question clear enough in the title. Here I give some examples and it would be explicit to all of us.
Example1: 'book ticket' vs 'ticket book' Example2: 'bill order' vs 'order bill'
The meanings of noun phrases are different after inverted. These two examples are not general enough from my point of view. And I have no idea about other noun phrases.
Can anyone come up with more excellent examples? Really appreciate.
Thank you so much for everyone helping me thinking about good examples.@ ohwilleke @tchrist @Jim @ Andrew Leach. Really appreciate.