instancy vs immediacy

instancy and immediacy both are nouns.

Word	Noun	Adjective	Verb	Adverb
instancy	Yes	No	No	No
immediacy	Yes	No	No	No

As nouns, instancy and immediacy are synonyms defined as:

Other synonyms of instancy include immediateness, instantaneousness.

instancy (noun)	immediacy (noun)
the quality of being insistent	the quickness of action or occurrence
the quickness of action or occurrence	lack of an intervening or mediating agency
	immediate intuitive awareness