oracle vs oracular

oracle is a noun but oracular is not a noun.

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

oracle (noun)	oracular (noun)
a shrine where an oracular god is consulted
a prophecy (usually obscure or allegorical) revealed by a priest or priestess; believed to be infallible
an authoritative person who divines the future

oracle (adjective)	oracular (adjective)
	of or relating to an oracle
	resembling an oracle in obscurity of thought
	obscurely prophetic