faithful vs constant

faithful and constant both are nouns.

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

faithful (noun)	constant (noun)
a group of people who adhere to a common faith and habitually attend a given church	a quantity that does not vary
any loyal and steadfast following	a number representing a quantity assumed to have a fixed value in a specified mathematical context

faithful (adjective)	constant (adjective)
steadfast in affection or allegiance	steadfast in purpose or devotion or affection
not having sexual relations with anyone except your husband or wife, or your boyfriend or girlfriend	uninterrupted in time and indefinitely long continuing
marked by fidelity to an original	unvarying in nature