invariability vs regularity

invariability and regularity both are nouns.

Word	Noun	Adjective	Verb	Adverb
invariability	Yes	No	No	No
regularity	Yes	No	No	No

As nouns, regularity is a hypernym of invariability; that is, regularity is a word with a broader meaning than invariability:

invariability (noun)	regularity (noun)
the quality of being resistant to variation	the quality of being characterized by a fixed principle or rate
a quality of uniformity and lack of variation	a property of polygons: the property of having equal sides and equal angles