What's the difference between catchword and workword?

Catchword

Definition:

(n.) Among theatrical performers, the last word of the preceding speaker, which reminds one that he is to speak next; cue.
(n.) The first word of any page of a book after the first, inserted at the right hand bottom corner of the preceding page for the assistance of the reader. It is seldom used in modern printing.
(n.) A word or phrase caught up and repeated for effect; as, the catchword of a political party, etc.

Example Sentences:

(1) This function gains particular significance considering the psychological concept of adolescence as being a particularly vulnerable phase in man's biographic course and the problematic position of modern industrial society discussed from the sociological side under the catchword "Colonialization of the life world (Lebenswelt)" (Habermas 1981).
(2) Putin said London and Moscow had common interests in bringing an end to the bloodshed, while maintaining Syria's territorial integrity – a catchword commonly used by Moscow to imply opposition to outside intervention.
(3) The catchword for multiskilled has become not "whether," but "how.