fidelity vs faithful

fidelity and faithful both are nouns.

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

fidelity (noun)	faithful (noun)
the quality of being faithful	a group of people who adhere to a common faith and habitually attend a given church
accuracy with which an electronic system reproduces the sound or image of its input signal	any loyal and steadfast following

fidelity (adjective)	faithful (adjective)
	steadfast in affection or allegiance
	not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend
	marked by fidelity to an original