accuracy vs fidelity

accuracy and fidelity both are nouns.

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

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

accuracy: the quality of being near to the true value
fidelity: accuracy with which an electronic system reproduces the sound or image of its input signal

Other hyponyms of accuracy include exactitude, exactness.

accuracy (noun)	fidelity (noun)
the quality of being near to the true value	the quality of being faithful
(mathematics) the number of significant figures given in a number	accuracy with which an electronic system reproduces the sound or image of its input signal