halo vs nimbus

halo and nimbus both are nouns.

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

As nouns, halo and nimbus are synonyms defined as:

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

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

halo (noun)	nimbus (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 dark grey cloud bearing rain
a toroidal shape