Splendour is a related term of showiness.
As nouns the difference between splendour and showiness
is that splendour is while showiness is the property of being showy.
splendour
English
Noun
(-)
Usage notes
The standard spelling in modern British English is splendour', with ' splendor being the American and dated British spelling.
showiness
English
Noun
(en-noun)
The property of being showy.