leanness vs lean

leanness and lean both are nouns.

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

leanness (noun)	lean (noun)
the property of having little body fat	the property possessed by a line or surface that departs from the vertical
the quality of being meager

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

leanness (verb)	lean (verb)
	rely on for support
	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