dogma vs credendum

dogma and credendum both are nouns.

Word	Noun	Adjective	Verb	Adverb
dogma	Yes	No	No	No
credendum	Yes	No	No	No

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

dogma: a religious doctrine that is proclaimed as true without proof
credendum: (Christianity) any of the sections into which a creed or other statement of doctrine is divided

Other hyponyms of dogma include article of faith.

dogma (noun)	credendum (noun)
a doctrine or code of beliefs accepted as authoritative	(Christianity) any of the sections into which a creed or other statement of doctrine is divided
a religious doctrine that is proclaimed as true without proof