repetitiveness vs repetitiousness

repetitiveness and repetitiousness both are nouns.

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

As nouns, repetitiveness and repetitiousness are synonyms defined as:

repetitiveness and repetitiousness: verboseness resulting from excessive repetitions

repetitiveness (noun)	repetitiousness (noun)
verboseness resulting from excessive repetitions	verboseness resulting from excessive repetitions