narrowness vs slimness

narrowness and slimness both are nouns.

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

As nouns, narrowness and slimness are synonyms defined as:

Other synonyms of narrowness include narrow margin.

narrowness (noun)	slimness (noun)
the property of being narrow; having little width	the property of an attractively thin person
a small margin	a small margin
an inclination to criticize opposing opinions or shocking behavior
a restriction of range or scope