guideword vs catchword

guideword and catchword both are nouns.

Word	Noun	Adjective	Verb	Adverb
guideword	Yes	No	No	No
catchword	Yes	No	No	No

As nouns, guideword and catchword are synonyms defined as:

guideword and catchword: 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

Other synonyms of guideword include guide word.

guideword (noun)	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	a favorite saying of a group, organization or individual
	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