steadiness vs sureness

steadiness and sureness both are nouns.

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

As nouns, sureness is a hyponym of steadiness; that is, sureness is a word with a more specific, narrower meaning than steadiness:

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

Other hyponyms of steadiness include granite, stability, stableness.

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