steadiness vs regularity

steadiness and regularity both are nouns.

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

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

steadiness (noun)	regularity (noun)
the quality of being steady or securely and immovably fixed in place	the quality of being characterized by a fixed principle or rate
the quality of being steady--regular and unvarying	a property of polygons: the property of having equal sides and equal angles
freedom from wavering or indecision; constancy of resolve or conduct