road map vs guidance

road map and guidance both are nouns.

Word	Noun	Adjective	Verb	Adverb
road map	Yes	No	No	No
guidance	Yes	No	No	No

As nouns, guidance is a hypernym of road map; that is, guidance is a word with a broader meaning than road map:

road map: a detailed plan or explanation to guide you in setting standards or determining a course of action
guidance: something that provides direction or advice as to a decision or course of action

Other hypernyms of road map include plan, program, programme, counsel, counseling, counselling, direction.

road map (noun)	guidance (noun)
a map showing roads (for automobile travel)	the act of setting and holding a course
a detailed plan or explanation to guide you in setting standards or determining a course of action	the act of guiding or showing the way
	something that provides direction or advice as to a decision or course of action