fundamentalness vs primacy

fundamentalness and primacy both are nouns.

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

As nouns, primacy is a hypernym of fundamentalness; that is, primacy is a word with a broader meaning than fundamentalness:

fundamentalness: The state or condition of being fundamental; essential importance.
primacy: the state of being first in importance

fundamentalness (noun)	primacy (noun)
The state or condition of being fundamental; essential importance.	the state of being first in importance