last word vs swank

last word and swank both are nouns.

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

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

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

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

last word (adjective)	swank (adjective)
	imposingly fashionable and elegant

last word (verb)	swank (verb)
	display proudly; act ostentatiously or pretentiously