slenderness vs thinness

slenderness and thinness both are nouns.

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

As nouns, thinness is a hypernym of slenderness; that is, thinness is a word with a broader meaning than slenderness:

Other hypernyms of slenderness include leanness, spareness.

As nouns, slenderness and thinness are synonyms defined as:

slenderness and thinness: relatively small dimension through an object as opposed to its length or width

Other synonyms of slenderness include tenuity.

slenderness (noun)	thinness (noun)
the quality of being slight or inadequate	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
relatively small dimension through an object as opposed to its length or width	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.