gaudy vs loud

gaudy is a noun but loud is not a noun.

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

As adjectives, gaudy and loud are synonyms defined as:

Other synonyms of gaudy include brassy, cheap, flash, flashy, garish, gimcrack, meretricious, tacky, tatty, tawdry, trashy.

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

gaudy (adjective)	loud (adjective)
(used especially of clothes) marked by conspicuous display	characterized by or producing sound of great volume or intensity
tastelessly showy	(used chiefly as a direction or description in music) indicating that said piece or segment should be played loudly
	tastelessly showy

gaudy (adverb)	loud (adverb)
	with relatively high volume