fiducial vs fiduciary

fiducial is not a noun while fiduciary is a noun.

Word	Noun	Adjective	Verb	Adverb
fiducial	No	Yes	No	No
fiduciary	Yes	Yes	No	No

As adjectives, fiducial and fiduciary are synonyms defined as:

fiducial and fiduciary: relating to or of the nature of a legal trust (i.e. the holding of something in trust for another)

fiducial (noun)	fiduciary (noun)
	a person who holds assets in trust for a beneficiary

fiducial (adjective)	fiduciary (adjective)
relating to or of the nature of a legal trust (i.e. the holding of something in trust for another)	relating to or of the nature of a legal trust (i.e. the holding of something in trust for another)
used as a fixed standard of reference for comparison or measurement
based on trust