faithful vs truehearted

faithful is a noun but truehearted is not a noun.

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

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

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