inauspiciousness vs unpropitiousness

inauspiciousness and unpropitiousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
inauspiciousness	Yes	No	No	No
unpropitiousness	Yes	No	No	No

As nouns, inauspiciousness and unpropitiousness are synonyms defined as:

inauspiciousness and unpropitiousness: the quality of suggesting an unsuccessful result

inauspiciousness (noun)	unpropitiousness (noun)
the quality of suggesting an unsuccessful result	the quality of suggesting an unsuccessful result