rollback vs reduction

rollback and reduction both are nouns.

Word	Noun	Adjective	Verb	Adverb
rollback	Yes	No	No	No
reduction	Yes	No	No	No

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

Other hypernyms of rollback include decrease, diminution, step-down.

rollback (noun)	reduction (noun)
the act of forcing the enemy to withdraw	the act of decreasing or reducing something
reducing prices back to some earlier level	the act of reducing complexity
	any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent