Catchword and Tag line

Catchword noun - A word printed at the top of the page of a dictionary or other reference book to indicate the first or last item on that page.

Tag line and catchword are semantically related In some cases you can use "Tag line" instead a noun "Catchword".

Tag line noun - The point of a joke or humorous story.

Catchword and tag line are semantically related in popular saying topic. You can use "Catchword" instead a noun phrase "Tag line".