chichi vs nattiness

chichi and nattiness both are nouns.

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

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

Other hyponyms of chichi include dapperness, jauntiness, rakishness.

chichi (noun)	nattiness (noun)
elegance by virtue of being fashionable	stylishness as evidenced by a smart appearance
someone who dresses in a trendy fashionable way

chichi (adjective)	nattiness (adjective)
affectedly trendy and fashionable