accuracy vs exactitude

accuracy and exactitude both are nouns.

Word	Noun	Adjective	Verb	Adverb
accuracy	Yes	No	No	No
exactitude	Yes	No	No	No

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

Other hyponyms of accuracy include exactness, fidelity.

accuracy (noun)	exactitude (noun)
the quality of being near to the true value	the quality of being exact
(mathematics) the number of significant figures given in a number