boldness vs hardihood

boldness and hardihood both are nouns.

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

As nouns, boldness and hardihood are synonyms defined as:

boldness and hardihood: the trait of being willing to undertake things that involve risk or danger

Other synonyms of boldness include daring, hardiness.

boldness (noun)	hardihood (noun)
the trait of being willing to undertake things that involve risk or danger	the trait of being willing to undertake things that involve risk or danger
the quality of standing out strongly and distinctly
impudent aggressiveness