auspiciousness vs propitiousness

auspiciousness and propitiousness both are nouns.

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

As nouns, auspiciousness and propitiousness are synonyms defined as:

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

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