nihil obstat vs indorsement

nihil obstat and indorsement both are nouns.

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

As nouns, indorsement is a hypernym of nihil obstat; that is, indorsement 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
indorsement: formal and explicit approval

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

nihil obstat (noun)	indorsement (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