halo vs aura

halo and aura both are nouns.

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

As nouns, halo and aura are synonyms defined as:

halo and aura: an indication of radiant light drawn around the head of a saint

Other synonyms of halo include aureole, gloriole, glory, nimbus.

halo (noun)	aura (noun)
an indication of radiant light drawn around the head of a saint	an indication of radiant light drawn around the head of a saint
a circle of light around the sun or moon	a distinctive but intangible quality surrounding a person or thing
a toroidal shape	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