Catchword and Words

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.

Words and catchword are semantically related. In some cases you can replace term "Words" with "Catchword", this nouns are similar.

Words noun - Language that is spoken or written.

Catchword and words are semantically related. Sometimes you can use "Catchword" instead a noun "Words".