loud vs gaudy

loud is not a noun while gaudy is a noun.

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

As adjectives, loud and gaudy are synonyms defined as:

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

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

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

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