euphory vs lightness

euphory and lightness both are nouns.

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

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

Other hypernyms of euphory include elation, high spirits.

euphory (noun)	lightness (noun)
a feeling of great (usually exaggerated) elation	the trait of being lighthearted and frivolous
	the visual effect of illumination on objects or scenes as created in pictures
	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