guidepost vs signpost

guidepost and signpost both are nouns.

Word	Noun	Adjective	Verb	Adverb
guidepost	Yes	No	No	No
signpost	Yes	No	Yes	No

As nouns, guidepost and signpost are synonyms defined as:

guidepost and signpost: a post bearing a sign that gives directions or shows the way

guidepost (noun)	signpost (noun)
a rule or principle that provides guidance to appropriate behavior	a post bearing a sign that gives directions or shows the way
a post bearing a sign that gives directions or shows the way

guidepost (verb)	signpost (verb)
	mark with a signpost, as of a path