chicness vs last word

chicness and last word both are nouns.

Word	Noun	Adjective	Verb	Adverb
chicness	Yes	No	No	No
last word	Yes	No	No	No

As nouns, chicness and last word are synonyms defined as:

Other synonyms of chicness include chic, chichi, modishness, smartness, stylishness, swank.

chicness (noun)	last word (noun)
elegance by virtue of being fashionable	elegance by virtue of being fashionable
	the final statement in a verbal argument
	an authoritative statement