contour vs contour line

contour and contour line both are nouns.

Word	Noun	Adjective	Verb	Adverb
contour	Yes	No	Yes	No
contour line	Yes	No	No	No

As nouns, contour and contour line are synonyms defined as:

contour and contour line: a line drawn on a map connecting points of equal height

contour (noun)	contour line (noun)
any spatial attributes (especially as defined by outline)	a line drawn on a map connecting points of equal height
a feature (or the order or arrangement of features) of anything having a complex structure
a line drawn on a map connecting points of equal height

contour (verb)	contour line (verb)
form the contours of