invariable vs strict

invariable is a noun but strict is not a noun.

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

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

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