circumstantial vs circumstance

circumstantial is not a noun while circumstance is a noun.

Word	Noun	Adjective	Verb	Adverb
circumstantial	No	Yes	No	No
circumstance	Yes	No	No	No

circumstantial (noun)	circumstance (noun)
	information that should be kept in mind when making a decision
	formal ceremony about important occasions
	a condition that accompanies or influences some event or activity
	the set of facts or circumstances that surround a situation or event

circumstantial (adjective)	circumstance (adjective)
fully detailed and specific about particulars