show off vs flaunt

show off is not a noun while flaunt is a noun.

Word	Noun	Adjective	Verb	Adverb
show off	No	No	Yes	No
flaunt	Yes	No	Yes	No

As verbs, show off and flaunt are synonyms defined as:

show off and flaunt: display proudly; act ostentatiously or pretentiously

Other synonyms of show off include flash, ostentate, swank.

show off (noun)	flaunt (noun)
	the act of displaying something ostentatiously

show off (verb)	flaunt (verb)
display proudly; act ostentatiously or pretentiously	display proudly; act ostentatiously or pretentiously