hardiness vs robustness

hardiness and robustness both are nouns.

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

As nouns, hardiness and robustness are synonyms defined as:

hardiness and robustness: the property of being strong and healthy in constitution

Other synonyms of hardiness include lustiness.

hardiness (noun)	robustness (noun)
the property of being strong and healthy in constitution	the property of being strong and healthy in constitution
the trait of being willing to undertake things that involve risk or danger	the characteristic of being strong enough to withstand intellectual challenge