shamelessness vs hardihood

shamelessness and hardihood both are nouns.

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

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

shamelessness: behavior marked by a bold defiance of the proprieties and lack of shame
hardihood: the trait of being willing to undertake things that involve risk or danger

Other hypernyms of shamelessness include boldness, daring, hardiness.

shamelessness (noun)	hardihood (noun)
behavior marked by a bold defiance of the proprieties and lack of shame	the trait of being willing to undertake things that involve risk or danger