lightness vs aura

lightness and aura both are nouns.

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

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

lightness: the visual effect of illumination on objects or scenes as created in pictures
aura: an indication of radiant light drawn around the head of a saint

Other hyponyms of lightness include aureole, gloriole, glory, halo, nimbus, sunniness, highlight, highlighting, brightness.

lightness (noun)	aura (noun)
the trait of being lighthearted and frivolous	an indication of radiant light drawn around the head of a saint
the visual effect of illumination on objects or scenes as created in pictures	a distinctive but intangible quality surrounding a person or thing
the property of being comparatively small in weight	a sensation (as of a cold breeze or bright light) that precedes the onset of certain disorders such as a migraine attack or epileptic seizure
having a light color
the gracefulness of a person or animal that is quick and nimble
a feeling of joy and pride