contour map vs relief map

contour map and relief map both are nouns.

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

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

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

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