nihil obstat vs endorsement

nihil obstat and endorsement both are nouns.

Word	Noun	Adjective	Verb	Adverb
nihil obstat	Yes	No	No	No
endorsement	Yes	No	No	No

As nouns, endorsement is a hypernym of nihil obstat; that is, endorsement is a word with a broader meaning than nihil obstat:

nihil obstat: the phrase used by the official censor of the Roman Catholic Church to say that a publication has been examined and contains nothing offensive to the church
endorsement: formal and explicit approval

Other hypernyms of nihil obstat include countenance, imprimatur, indorsement, sanction, warrant.

nihil obstat (noun)	endorsement (noun)
authoritative approval	the act of endorsing
the phrase used by the official censor of the Roman Catholic Church to say that a publication has been examined and contains nothing offensive to the church	formal and explicit approval
	a promotional statement (as found on the dust jackets of books)
	a speech seconding a motion
	a signature that validates something