guidebook vs roadbook

guidebook and roadbook both are nouns.

Word	Noun	Adjective	Verb	Adverb
guidebook	Yes	No	No	No
roadbook	Yes	No	No	No

As nouns, roadbook is a hyponym of guidebook; that is, roadbook is a word with a more specific, narrower meaning than guidebook:

guidebook: something that offers basic information or instruction
roadbook: a guidebook describing the roads of a country; contains maps and (sometimes) a gazetteer

Other hyponyms of guidebook include field guide, itinerary, travel guidebook.

guidebook (noun)	roadbook (noun)
something that offers basic information or instruction	a guidebook describing the roads of a country; contains maps and (sometimes) a gazetteer