rollback vs step-down

rollback and step-down both are nouns.

Word	Noun	Adjective	Verb	Adverb
rollback	Yes	No	No	No
step-down	Yes	No	No	No

As nouns, step-down is a hypernym of rollback; that is, step-down is a word with a broader meaning than rollback:

Other hypernyms of rollback include decrease, diminution, reduction.

rollback (noun)	step-down (noun)
the act of forcing the enemy to withdraw	the act of decreasing or reducing something
reducing prices back to some earlier level