signpost vs guidepost

signpost and guidepost both are nouns.

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

As nouns, signpost and guidepost are synonyms defined as:

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

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

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