oracle vs diviner

oracle and diviner both are nouns.

Word	Noun	Adjective	Verb	Adverb
oracle	Yes	No	No	No
diviner	Yes	No	No	No

As nouns, diviner is a hypernym of oracle; that is, diviner is a word with a broader meaning than oracle:

oracle: an authoritative person who divines the future
diviner: someone who claims to discover hidden knowledge with the aid of supernatural powers

oracle (noun)	diviner (noun)
a shrine where an oracular god is consulted	someone who claims to discover hidden knowledge with the aid of supernatural powers
a prophecy (usually obscure or allegorical) revealed by a priest or priestess; believed to be infallible
an authoritative person who divines the future