showiness vs showy

showiness is a noun but showy is not a noun.

Word	Noun	Adjective	Verb	Adverb
showiness	Yes	No	No	No
showy	No	Yes	No	No

showiness (noun)	showy (noun)
extravagant elaborateness

showiness (adjective)	showy (adjective)
	superficially attractive and stylish; suggesting wealth or expense
	(used especially of clothes) marked by conspicuous display
	marked by ostentation but often tasteless
	displaying brilliance and virtuosity