healthiness vs energy

healthiness and energy both are nouns.

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

As nouns, energy is a hyponym of healthiness; that is, energy is a word with a more specific, narrower meaning than healthiness:

healthiness: the state of being vigorous and free from bodily or mental disease
energy: a healthy capacity for vigorous activity

healthiness (noun)	energy (noun)
the state of being vigorous and free from bodily or mental disease	forceful exertion
	an imaginative lively style (especially style of writing)
	enterprising or ambitious drive
	(physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs
	any source of usable power
	a healthy capacity for vigorous activity