credendum vs tenet

credendum and tenet both are nouns.

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

As nouns, tenet is a hypernym of credendum; that is, tenet is a word with a broader meaning than credendum:

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

Other hypernyms of credendum include dogma.

credendum (noun)	tenet (noun)
(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