audaciousness vs hardihood

audaciousness and hardihood both are nouns.

Word	Noun	Adjective	Verb	Adverb
audaciousness	Yes	No	No	No
hardihood	Yes	No	No	No

As nouns, hardihood is a hypernym of audaciousness; that is, hardihood is a word with a broader meaning than audaciousness:

audaciousness: fearless daring
hardihood: the trait of being willing to undertake things that involve risk or danger

Other hypernyms of audaciousness include boldness, daring, hardiness.

audaciousness (noun)	hardihood (noun)
fearless daring	the trait of being willing to undertake things that involve risk or danger
aggressive boldness or unmitigated effrontery