consistent vs invariable

consistent is not a noun while invariable is a noun.

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

consistent (noun)	invariable (noun)
	a quantity that does not vary

consistent (adjective)	invariable (adjective)
(sometimes followed by `with') in agreement or consistent or reliable	not liable to or capable of change
marked by an orderly, logical, and aesthetically consistent relation of parts
capable of being reproduced
the same throughout in structure or composition