roadbook vs guidebook

roadbook and guidebook both are nouns.

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

As nouns, guidebook is a hypernym of roadbook; that is, guidebook is a word with a broader meaning than roadbook:

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

Other hypernyms of roadbook include guide.

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