propitiousness vs auspiciousness

propitiousness and auspiciousness both are nouns.

Word	Noun	Adjective	Verb	Adverb
propitiousness	Yes	No	No	No
auspiciousness	Yes	No	No	No

As nouns, propitiousness and auspiciousness are synonyms defined as:

propitiousness and auspiciousness: the favorable quality of strongly indicating a successful result

propitiousness (noun)	auspiciousness (noun)
the favorable quality of strongly indicating a successful result	the favorable quality of strongly indicating a successful result