Difference between Pompousness and Ostentatiousness

POMPOUSNESS vs OSTENTATIOUSNESS: NOUN

The quality of being pompous
Synonyms See pompous.
The character of being pompous; also, pompous conduct; magnificence; splendor; great display or show; ostentatiousness.
Lack of elegance as a consequence of being pompous and puffed up with vanity

The property or characteristic of being ostentatious.
The state or quality of being ostentatious; vain display; boastfulness; vanity; ostentation.
Lack of elegance as a consequence of being pompous and puffed up with vanity

Sanctimoniousness, Egotism, Presumptuousness, Boastfulness, Bombast, Smugness, Superciliousness, Pretension, Grandiloquence, Haughtiness, Splashiness, Ostentatiousness, Ostentation, Pretentiousness, Pomposity

Haughtiness, Conspicuous consumption, Suavity, Flamboyance, Flashiness, Garishness, Showiness, Gaudiness, Opulence, Extravagance, Splashiness, Pretentiousness, Pomposity, Pompousness, Ostentation

Pedantry, Vapidity, Sanctimony, Affectation, Imperiousness, Priggishness, Sanctimoniousness, Presumptuousness, Bombast, Smugness, Superciliousness, Pretension, Grandiloquence, Ostentatiousness, Ostentation

Vainglory, Superciliousness, Regality, Imperiousness, Foppery, Sumptuousness, Conspicuous consumption, Suavity, Flamboyance, Flashiness, Garishness, Opulence, Extravagance, Pompousness, Ostentation

And to cure himself of at least one type of pompousness, he should really try some Chicken Tikka Masala.

Without a doubt, we must embrace a certain spirit of simplicity that eschews the ostentatiousness or sumptuousness that is warned against.
The problem with this is that it gives rise to a perception of extravagance and ostentatiousness from a developing country.
Changes in currency exchange rates and high ostentatiousness which is inversely affecting the global commercial enterprise.
Perhaps this ostentatiousness obscures the real question of how deep his influence has been.