lean vs slope

lean and slope both are nouns.

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

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

Other hyponyms of lean include incline, pitch, weather, heel, list, lean back, recline.

lean (noun)	slope (noun)
the property possessed by a line or surface that departs from the vertical	the property possessed by a line or surface that departs from the horizontal
	an elevated geological formation

lean (adjective)	slope (adjective)
lacking in mineral content or combustible material
lacking excess flesh
not profitable or prosperous
containing little excess

lean (verb)	slope (verb)
rely on for support	be at an angle
cause to lean or incline
to incline or bend from a vertical position
cause to lean to the side
have a tendency or disposition to do or be something; be inclined