truehearted vs faithful

truehearted is not a noun while faithful is a noun.

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

truehearted (noun)	faithful (noun)
	a group of people who adhere to a common faith and habitually attend a given church
	any loyal and steadfast following

truehearted (adjective)	faithful (adjective)
unwavering in devotion to friend or vow or cause	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