nattiness vs modishness

nattiness and modishness both are nouns.

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

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

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

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