nattiness vs stylishness

nattiness and stylishness both are nouns.

Word	Noun	Adjective	Verb	Adverb
nattiness	Yes	No	No	No
stylishness	Yes	No	No	No

As nouns, stylishness is a hypernym of nattiness; that is, stylishness is a word with a broader meaning than nattiness:

Other hypernyms of nattiness include chic, chichi, chicness, last word, modishness, smartness, swank.

nattiness (noun)	stylishness (noun)
stylishness as evidenced by a smart appearance	elegance by virtue of being fashionable