unevenness vs rockiness

unevenness and rockiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
unevenness	Yes	No	No	No
rockiness	Yes	No	No	No

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

Other hyponyms of unevenness include ruggedness, jaggedness, patchiness, waviness.

unevenness (noun)	rockiness (noun)
the quality of being uneven and lacking uniformity	the quality of abounding in rocks and stones
the quality of being unbalanced