Catchword and Catch 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.

Catch line and catchword are semantically related. In some cases you can replace phrase "Catch line" with "Catchword", this terms are similar.

Catchword and catch line are semantically related. Sometimes you can replace term "Catchword" with "Catch line", this terms are similar.