nattiness vs smartness

nattiness and smartness both are nouns.

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

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

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

nattiness (noun)	smartness (noun)
stylishness as evidenced by a smart appearance	elegance by virtue of being fashionable
	liveliness and eagerness
	intelligence as manifested in being quick and witty
	a kind of pain such as that caused by a wound or a burn or a sore