parhelic circle vs halo

parhelic circle and halo both are nouns.

Word	Noun	Adjective	Verb	Adverb
parhelic circle	Yes	No	No	No
halo	Yes	No	No	No

As nouns, halo is a hypernym of parhelic circle; that is, halo is a word with a broader meaning than parhelic circle:

parhelic circle: a luminous halo parallel to the horizon at the altitude of the sun; caused by ice crystals in the atmosphere
halo: a circle of light around the sun or moon

parhelic circle (noun)	halo (noun)
a luminous halo parallel to the horizon at the altitude of the sun; caused by ice crystals in the atmosphere	an indication of radiant light drawn around the head of a saint
	a circle of light around the sun or moon
	a toroidal shape