leanness vs insufficiency

leanness and insufficiency both are nouns.

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

As nouns, insufficiency is a hypernym of leanness; that is, insufficiency is a word with a broader meaning than leanness:

Other hypernyms of leanness include deficiency, inadequacy.

leanness (noun)	insufficiency (noun)
the property of having little body fat	lack of an adequate quantity or number
the quality of being meager	(pathology) inability of a bodily part or organ to function normally
	a lack of competence