gaudy vs tawdry

gaudy is a noun but tawdry is not a noun.

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

As adjectives, gaudy and tawdry are synonyms defined as:

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

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

gaudy (adjective)	tawdry (adjective)
(used especially of clothes) marked by conspicuous display	made of inferior workmanship and materials
tastelessly showy	tastelessly showy