decisiveness vs conclusiveness

decisiveness and conclusiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
decisiveness	Yes	No	No	No
conclusiveness	Yes	No	No	No

As nouns, decisiveness and conclusiveness are synonyms defined as:

decisiveness and conclusiveness: the quality of being final or definitely settled

Other synonyms of decisiveness include finality.

decisiveness (noun)	conclusiveness (noun)
the trait of resoluteness as evidenced by firmness of character or purpose	the quality of being final or definitely settled
the quality of being final or definitely settled