slope vs coast

slope and coast both are nouns.

Word	Noun	Adjective	Verb	Adverb
slope	Yes	No	Yes	No
coast	Yes	No	Yes	No

As nouns, coast is a hyponym of slope; that is, coast is a word with a more specific, narrower meaning than slope:

slope (noun)	coast (noun)
the property possessed by a line or surface that departs from the horizontal	the act of moving smoothly along a surface while remaining in contact with it
an elevated geological formation	the area within view
	the shore of a sea or ocean
	a slope down which sleds may coast

slope (verb)	coast (verb)
be at an angle	move effortlessly; by force of gravity