Catchword vs Watchhword - What's the difference?

Watchhword is likely misspelled.

Watchhword has no English definition.

is a word under the right-hand side of the last line on a book page that repeats the first word on the following page.

(en noun)

A word under the right-hand side of the last line on a book page that repeats the first word on the following page.

A word or expression repeated until it becomes representative of a party, school, business, or point of view.

Among theatrical performers, the last word of the preceding speaker, which reminds one that he is to speak next; cue.

*(word under right-hand side ): guide word *(word repeated to become representative ): watchword