Grandeur is a synonym of augustness.
As nouns the difference between grandeur and augustness
is that grandeur is the state of being grand or splendid; magnificence while augustness is the state or quality of being august or noble.
grandeur
English
Noun
(-)
The state of being grand or splendid; magnificence.
Nobility.
(archaic, rare) Greatness; largeness; tallness; loftiness.
References
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augustness
English
Noun
(head)
The state or quality of being august or noble.