lightness vs joy

lightness and joy both are nouns.

Word	Noun	Adjective	Verb	Adverb
lightness	Yes	No	No	No
joy	Yes	No	Yes	No

As nouns, joy is a hypernym of lightness; that is, joy is a word with a broader meaning than lightness:

Other hypernyms of lightness include joyfulness, joyousness.

lightness (noun)	joy (noun)
the trait of being lighthearted and frivolous	something or someone that provides a source of happiness
the visual effect of illumination on objects or scenes as created in pictures	the emotion of great happiness
the property of being comparatively small in weight
having a light color
the gracefulness of a person or animal that is quick and nimble
a feeling of joy and pride

lightness (verb)	joy (verb)
	feel happiness or joy
	make glad or happy