sturdiness vs healthiness

sturdiness and healthiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
sturdiness	Yes	No	No	No
healthiness	Yes	No	No	No

As nouns, healthiness is a hypernym of sturdiness; that is, healthiness is a word with a broader meaning than sturdiness:

sturdiness: the state of being vigorous and robust
healthiness: the state of being vigorous and free from bodily or mental disease

Other hypernyms of sturdiness include good health.

sturdiness (noun)	healthiness (noun)
the property of something that is strongly built	the state of being vigorous and free from bodily or mental disease
resoluteness evidenced by strength of character
the state of being vigorous and robust