boldness vs hardiness

boldness and hardiness both are nouns.

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

As nouns, boldness and hardiness are synonyms defined as:

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

Other synonyms of boldness include daring, hardihood.

boldness (noun)	hardiness (noun)
the trait of being willing to undertake things that involve risk or danger	the property of being strong and healthy in constitution
the quality of standing out strongly and distinctly	the trait of being willing to undertake things that involve risk or danger
impudent aggressiveness