moral principle vs precept

moral principle and precept both are nouns.

Word	Noun	Adjective	Verb	Adverb
moral principle	Yes	No	No	No
precept	Yes	No	No	No

As nouns, precept is a hypernym of moral principle; that is, precept is a word with a broader meaning than moral principle:

Other hypernyms of moral principle include principle.

moral principle (noun)	precept (noun)
the principles of right and wrong that are accepted by an individual or a social group	a doctrine that is taught
the principle that conduct should be moral	rule of personal conduct