hardiness vs lustiness

hardiness and lustiness both are nouns.

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

As nouns, hardiness and lustiness are synonyms defined as:

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

Other synonyms of hardiness include robustness.

hardiness (noun)	lustiness (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