gaffe vs bloomer

gaffe and bloomer both are nouns.

Word	Noun	Adjective	Verb	Adverb
gaffe	Yes	No	No	No
bloomer	Yes	No	No	No

As nouns, bloomer is a hypernym of gaffe; that is, bloomer is a word with a broader meaning than gaffe:

Other hypernyms of gaffe include blooper, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall.

gaffe (noun)	bloomer (noun)
a socially awkward or tactless act	an embarrassing mistake
	a flower that blooms in a particular way