brassy vs gimcrack

brassy is not a noun while gimcrack is a noun.

Word	Noun	Adjective	Verb	Adverb
brassy	No	Yes	No	No
gimcrack	Yes	Yes	No	No

As adjectives, brassy and gimcrack are synonyms defined as:

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

brassy (noun)	gimcrack (noun)
	ornamental objects of no great value

brassy (adjective)	gimcrack (adjective)
resembling the sound of a brass instrument	tastelessly showy
tastelessly showy
unrestrained by convention or propriety