adventurousness vs hardihood

adventurousness and hardihood both are nouns.

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

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

adventurousness: the trait of being adventurous
hardihood: the trait of being willing to undertake things that involve risk or danger

Other hypernyms of adventurousness include boldness, daring, hardiness.

adventurousness (noun)	hardihood (noun)
the trait of being adventurous	the trait of being willing to undertake things that involve risk or danger