mitzvah vs precept

mitzvah and precept both are nouns.

Word	Noun	Adjective	Verb	Adverb
mitzvah	Yes	No	No	No
precept	Yes	No	No	No

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

Other hypernyms of mitzvah include commandment, teaching.

mitzvah (noun)	precept (noun)
(Judaism) a good deed performed out of religious duty	a doctrine that is taught
(Judaism) a precept or commandment of the Jewish law	rule of personal conduct