gaudy vs showy

gaudy is a noun but showy is not a noun.

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

As adjectives, gaudy and showy are synonyms defined as:

gaudy and showy: (used especially of clothes) marked by conspicuous display

Other synonyms of gaudy include flashy, jazzy, sporty.

gaudy (noun)	showy (noun)
(Britain) a celebratory reunion feast or entertainment held at a college

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