consistent vs consistency

consistent is not a noun while consistency is a noun.

Word	Noun	Adjective	Verb	Adverb
consistent	No	Yes	No	No
consistency	Yes	No	No	No

consistent (noun)	consistency (noun)
	the property of holding together and retaining its shape
	(logic) an attribute of a logical system that is so constituted that none of the propositions deducible from the axioms contradict one another
	a harmonious uniformity or agreement among things or parts
	logical coherence and accordance with the facts

consistent (adjective)	consistency (adjective)
(sometimes followed by `with') in agreement or consistent or reliable
marked by an orderly, logical, and aesthetically consistent relation of parts
capable of being reproduced
the same throughout in structure or composition