grandness vs primacy

grandness and primacy both are nouns.

Word	Noun	Adjective	Verb	Adverb
grandness	Yes	No	No	No
primacy	Yes	No	No	No

As nouns, primacy is a hyponym of grandness; that is, primacy is a word with a more specific, narrower meaning than grandness:

Other hyponyms of grandness include accent, emphasis.

grandness (noun)	primacy (noun)
the quality of being magnificent or splendid or grand	the state of being first in importance
unusual largeness in size or extent or number
splendid or imposing in size or appearance
a prominent status