repetitiousness vs repetitiveness

repetitiousness and repetitiveness both are nouns.

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

As nouns, repetitiousness and repetitiveness are synonyms defined as:

repetitiousness and repetitiveness: verboseness resulting from excessive repetitions

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