showy vs gaudy

showy is not a noun while gaudy is a noun.

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

As adjectives, showy and gaudy are synonyms defined as:

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

Other synonyms of showy include flashy, jazzy, sporty.

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

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