lightness vs euphory

lightness and euphory both are nouns.

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

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

Other hyponyms of lightness include euphoria.

lightness (noun)	euphory (noun)
the trait of being lighthearted and frivolous	a feeling of great (usually exaggerated) elation
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