garish vs flashy

garish and flashy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
garish	No	Yes	No	No
flashy	No	Yes	No	No

As adjectives, garish and flashy are synonyms defined as:

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

garish (adjective)	flashy (adjective)
tastelessly showy	(used especially of clothes) marked by conspicuous display
	tastelessly showy