jazzy vs gaudy

jazzy is not a noun while gaudy is a noun.

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

As adjectives, jazzy and gaudy are synonyms defined as:

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

Other synonyms of jazzy include flashy, showy, sporty.

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

jazzy (adjective)	gaudy (adjective)
(used especially of clothes) marked by conspicuous display	(used especially of clothes) marked by conspicuous display
resembling jazz (especially in its rhythm)	tastelessly showy