narrowness vs thinness

narrowness and thinness both are nouns.

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

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

Other hyponyms of narrowness include fineness.

narrowness (noun)	thinness (noun)
the property of being narrow; having little width	the property of having little body fat
a small margin	relatively small dimension through an object as opposed to its length or width
an inclination to criticize opposing opinions or shocking behavior	a consistency of low viscosity
a restriction of range or scope	the property of being very narrow or thin
	the property of being scanty or scattered; lacking denseness
	The property of lacking substance or strength.