gaudy vs jazzy

gaudy is a noun but jazzy is not a noun.

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

As adjectives, gaudy and jazzy are synonyms defined as:

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

Other synonyms of gaudy include flashy, showy, sporty.

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

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