fidelity vs accuracy

fidelity and accuracy both are nouns.

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

As nouns, accuracy is a hypernym of fidelity; that is, accuracy is a word with a broader meaning than fidelity:

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

Other hypernyms of fidelity include truth.

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