Catchword and Tip-off

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.

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

Tip-off noun - Something that tells of approaching danger or risk.

Catchword and tip-off are semantically related. Sometimes you can use "Catchword" instead a noun phrase "Tip-off".