strict vs invariable

strict is not a noun while invariable is a noun.

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

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

strict (adjective)	invariable (adjective)
characterized by strictness, severity, or restraint	not liable to or capable of change
severe and unremitting in making demands
rigidly accurate; allowing no deviation from a standard
incapable of compromise or flexibility
(of rules) stringently enforced