chic vs last word

chic and last word both are nouns.

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

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

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

chic (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

chic (adjective)	last word (adjective)
elegant and stylish