fidelity vs loyalty

fidelity and loyalty both are nouns.

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

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

Other hyponyms of fidelity include constancy, dedication, trueness.

fidelity (noun)	loyalty (noun)
the quality of being faithful	the act of binding yourself (intellectually or emotionally) to a course of action
accuracy with which an electronic system reproduces the sound or image of its input signal	the quality of being loyal
	feelings of allegiance