swank vs last word

swank and last word both are nouns.

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

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

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

swank (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

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

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