pedantry vs ostentation

pedantry and ostentation both are nouns.

Word	Noun	Adjective	Verb	Adverb
pedantry	Yes	No	No	No
ostentation	Yes	No	No	No

As nouns, ostentation is a hypernym of pedantry; that is, ostentation is a word with a broader meaning than pedantry:

Other hypernyms of pedantry include fanfare, flash.

pedantry (noun)	ostentation (noun)
an ostentatious and inappropriate display of learning	pretentious or showy or vulgar display
	lack of elegance as a consequence of being pompous and puffed up with vanity
	a gaudy outward display