redundancy vs repetitiveness

redundancy and repetitiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
redundancy	Yes	No	No	No
repetitiveness	Yes	No	No	No

As nouns, repetitiveness is a hypernym of redundancy; that is, repetitiveness is a word with a broader meaning than redundancy:

redundancy: repetition of messages to reduce the probability of errors in transmission
repetitiveness: verboseness resulting from excessive repetitions

Other hypernyms of redundancy include repetitiousness.

redundancy (noun)	repetitiveness (noun)
repetition of an act needlessly	verboseness resulting from excessive repetitions
the attribute of being superfluous and unneeded
(electronics) a system design that duplicates components to provide alternatives in case one component fails
repetition of messages to reduce the probability of errors in transmission