relief map vs contour map

relief map and contour map both are nouns.

Word	Noun	Adjective	Verb	Adverb
relief map	Yes	No	No	No
contour map	Yes	No	No	No

As nouns, relief map and contour map are synonyms defined as:

relief map and contour map: a map having contour lines through points of equal elevation

relief map (noun)	contour map (noun)
a map having contour lines through points of equal elevation	a map having contour lines through points of equal elevation