exactness vs trueness

exactness and trueness both are nouns.

Word	Noun	Adjective	Verb	Adverb
exactness	Yes	No	No	No
trueness	Yes	No	No	No

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

Other hyponyms of exactness include minuteness, preciseness, precision.

exactness (noun)	trueness (noun)
the quality of being exact	exactness of adjustment
	the quality of being loyal
	conformity to reality or actuality