positiveness vs indubitability

positiveness and indubitability both are nouns.

Word	Noun	Adjective	Verb	Adverb
positiveness	Yes	No	No	No
indubitability	Yes	No	No	No

As nouns, indubitability is a hypernym of positiveness; that is, indubitability is a word with a broader meaning than positiveness:

Other hypernyms of positiveness include indisputability, unquestionability, unquestionableness.

positiveness (noun)	indubitability (noun)
a quality or state characterized by certainty or acceptance or affirmation and dogmatic assertiveness	the quality of being beyond question or dispute or doubt
the quality of being encouraging or promising of a successful outcome
the quality of being undeniable and not worth arguing about
an amount greater than zero
the character of the positive electric pole