gimcrack vs brassy

gimcrack is a noun but brassy is not a noun.

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

As adjectives, gimcrack and brassy are synonyms defined as:

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

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

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