Catchword and Epithet

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.

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

Epithet noun - A descriptive or familiar name given instead of or in addition to the one belonging to an individual.

Catchword and epithet are semantically related. Sometimes you can use "Catchword" instead a noun "Epithet".