rakishness vs last word

rakishness and last word both are nouns.

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

As nouns, last word is a hypernym of rakishness; that is, last word is a word with a broader meaning than rakishness:

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

rakishness (noun)	last word (noun)
stylishness as evidenced by a smart appearance	elegance by virtue of being fashionable
the quality of a rake	the final statement in a verbal argument
	an authoritative statement