trusty vs fiducial

trusty is a noun but fiducial is not a noun.

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

trusty (noun)	fiducial (noun)
a convict who is considered trustworthy and granted special privileges

trusty (adjective)	fiducial (adjective)
worthy of trust or belief	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