sureness vs steadiness

sureness and steadiness both are nouns.

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

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

sureness: the quality of being steady and unfailing
steadiness: the quality of being steady or securely and immovably fixed in place

Other hypernyms of sureness include firmness.

sureness (noun)	steadiness (noun)
the quality of being steady and unfailing	the quality of being steady or securely and immovably fixed in place
freedom from doubt; belief in yourself and your abilities	the quality of being steady--regular and unvarying
	freedom from wavering or indecision; constancy of resolve or conduct