hardiness vs hardy

hardiness is a noun but hardy is not a noun.

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

hardiness (noun)	hardy (noun)
the property of being strong and healthy in constitution
the trait of being willing to undertake things that involve risk or danger

hardiness (adjective)	hardy (adjective)
	invulnerable to fear or intimidation
	having rugged physical strength; inured to fatigue or hardships
	able to survive under unfavorable weather conditions