thinness vs slimness

thinness and slimness both are nouns.

Word	Noun	Adjective	Verb	Adverb
thinness	Yes	No	No	No
slimness	Yes	No	No	No

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

thinness (noun)	slimness (noun)
the property of having little body fat	the property of an attractively thin person
relatively small dimension through an object as opposed to its length or width	a small margin
a consistency of low viscosity
the property of being very narrow or thin
the property of being scanty or scattered; lacking denseness
The property of lacking substance or strength.